Remove outdated mbedtls recipe

This recipe was added 8 years ago in the context of supporting awsiotsdk, back
when there were no community recipes for a v2.X.X version. meta-openembedded
now has recipes for both v3.6.2 and v2.28.9, and our recipe has been outdated
for a while now, so remove it.

Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>

meta-digi-dey/recipes-connectivity/mbedtls/mbedtls-2.1.1/0001-mbedtls-library-add-pkg-config-file.patch

@@ -1,43 +0,0 @@
-From: Tatiana Leon <tatiana.leon@digi.com>
-Date: Fri, 28 Apr 2017 14:47:43 +0200
-Subject: [PATCH] mbedtls library: add pkg-config file
-
-Upstream-Status: Inappropriate [DEY specific]
-
-Signed-off-by: Tatiana Leon <tatiana.leon@digi.com>
----
- CMakeLists.txt |  4 ++++
- mbedtls.pc.in  | 12 ++++++++++++
- 2 files changed, 16 insertions(+)
- create mode 100644 mbedtls.pc.in
-
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 094d906..b662eee 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -124,3 +124,7 @@ if(ENABLE_TESTING)
-         )
-     endif(UNIX)
- endif()
-+
-+SET(prefix ${CMAKE_INSTALL_PREFIX})
-+CONFIGURE_FILE(${CMAKE_SOURCE_DIR}/mbedtls.pc.in ${CMAKE_BINARY_DIR}/mbedtls.pc @ONLY)
-+INSTALL(FILES ${CMAKE_BINARY_DIR}/mbedtls.pc DESTINATION ${LIB_INSTALL_DIR}/pkgconfig)
-diff --git a/mbedtls.pc.in b/mbedtls.pc.in
-new file mode 100644
-index 0000000..9eff4ac
---- /dev/null
-+++ b/mbedtls.pc.in
-@@ -0,0 +1,12 @@
-+prefix=@prefix@
-+exec_prefix=${prefix}
-+libdir=${exec_prefix}/lib
-+includedir=${prefix}/include
-+
-+Name: mbedtls
-+Description: Light-weight open source cryptographic and SSL/TLS library
-+Version: 2.1.1
-+
-+Libs: -L${libdir} -lmbedtls -lmbedcrypto -lmbedx509
-+Cflags: -I${includedir}/mbedtls
-+

meta-digi-dey/recipes-connectivity/mbedtls/mbedtls_2.1.1.bb

@@ -1,48 +0,0 @@
-# Copyright (C) 2017, Digi International Inc.
-
-SUMMARY = "An open source, portable, easy to use, readable and flexible SSL \
-library"
-DESCRIPTION = "mbedtls is a lean open source crypto library          \
-for providing SSL and TLS support in your programs. It offers        \
-an intuitive API and documented header files, so you can actually    \
-understand what the code does. It features:                          \
-                                                                     \
- - Symmetric algorithms, like AES, Blowfish, Triple-DES, DES, ARC4,  \
-   Camellia and XTEA                                                 \
- - Hash algorithms, like SHA-1, SHA-2, RIPEMD-160 and MD5            \
- - Entropy pool and random generators, like CTR-DRBG and HMAC-DRBG   \
- - Public key algorithms, like RSA, Elliptic Curves, Diffie-Hellman, \
-   ECDSA and ECDH                                                    \
- - SSL v3 and TLS 1.0, 1.1 and 1.2                                   \
- - Abstraction layers for ciphers, hashes, public key operations,    \
-   platform abstraction and threading                                \
-"
-
-HOMEPAGE = "https://tls.mbed.org/"
-SECTION = "libdevel"
-BUGTRACKER = "https://github.com/ARMmbed/mbedtls/issues"
-LICENSE = "Apache-2.0"
-LIC_FILES_CHKSUM = "file://LICENSE;md5=302d50a6369f5f22efdb674db908167a"
-
-SRC_URI = " \
-    git://github.com/Mbed-TLS/mbedtls.git;protocol=https;branch=master \
-    file://0001-mbedtls-library-add-pkg-config-file.patch \
-"
-
-# Tag 'mbedtls-2.1.1'
-SRCREV = "8cea8ad8b825b0bf5884054af7499f1d5c3ebeb4"
-
-S = "${WORKDIR}/git"
-
-inherit cmake
-
-EXTRA_OECMAKE = " \
-    -DENABLE_PROGRAMS:BOOL=OFF \
-    -DENABLE_TESTING:BOOL=OFF \
-    -DUSE_STATIC_MBEDTLS_LIBRARY:BOOL=ON \
-    -DUSE_SHARED_MBEDTLS_LIBRARY:BOOL=ON \
-    -DLIB_INSTALL_DIR:STRING=${libdir} \
-    -DCMAKE_INSTALL_PREFIX:PATH=${prefix} \
-"
-
-ALLOW_EMPTY:${PN} = "1"