ccmp1: u-boot-dey: merge FIT signature config fragments into a single file

Unless we have a use case in which we need to apply these fragments separately,
we can merge them both into a single fragment.

https://onedigi.atlassian.net/browse/DEL-8946

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

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccmp1/fit_legacy.cfg

@@ -1 +0,0 @@
-# CONFIG_LEGACY_IMAGE_FORMAT is not set

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey/ccmp1/fit_signature.cfg

@@ -1,3 +1,4 @@
+# CONFIG_LEGACY_IMAGE_FORMAT is not set
 CONFIG_FIT_SIGNATURE=y
 CONFIG_RSA=y
 CONFIG_ECDSA=y

meta-digi-arm/recipes-bsp/u-boot/u-boot-dey_2021.10.bb

@@ -9,13 +9,8 @@ DEPENDS += "python3-setuptools-native"
 SRCBRANCH = "v2021.10/master"
 SRCREV = "${AUTOREV}"
 
-UBOOT_FIT_CFG_FRAGMENTS = " \
-    file://fit_legacy.cfg \
-    file://fit_signature.cfg \
-"
-
 SRC_URI += " \
-    ${@oe.utils.conditional('TRUSTFENCE_FIT_IMG', '1', '${UBOOT_FIT_CFG_FRAGMENTS}', '', d)} \
+    ${@oe.utils.conditional('TRUSTFENCE_FIT_IMG', '1', 'file://fit_signature.cfg', '', d)} \
 "
 
 install_helper_files() {