udev: disable uSD card mounting for the CCMP1

This commit disables the uSD mounting, due to issues
detected during the boot process when UBIFS starts
with the wear-leveling process to erase NAND blocks.

https://onedigi.atlassian.net/browse/DEL-8415

Signed-off-by: Mike Engel <Mike.Engel@digi.com>

meta-digi-arm/recipes-core/udev/udev-extraconf/00-disable-sd.rules

@@ -0,0 +1,2 @@
+# Disable all SD devices
+SUBSYSTEMS=="mmc", ATTRS{type}=="SD", RUN:="/bin/true"

meta-digi-arm/recipes-core/udev/udev-extraconf_1.1.bbappend

@@ -9,6 +9,7 @@ SRC_URI += " \
 "
 SRC_URI:append:ccmp1 = " \
     file://99-ext-rtc-wakeup.rules \
+    file://00-disable-sd.rules \
 "
 
 do_install:append() {
@@ -59,6 +60,9 @@ do_install:append() {
 
 do_install:append:ccmp1() {
 	install -m 0644 ${WORKDIR}/99-ext-rtc-wakeup.rules ${D}${sysconfdir}/udev/rules.d/
+	# Disables all SD device but keeps on mounting other external memory devices like USB.
+	# This is currently needed for the CCMP1 platform as a workaround to fix a boot issue.
+	install -m 0644 ${WORKDIR}/00-disable-sd.rules ${D}${sysconfdir}/udev/rules.d/
 }
 
 FILES:${PN}:append = " \