Convert to new override syntax

This is the result of automated script conversion:

scripts/contrib/convert-overrides.py <oe-core directory>

converting the metadata to use ":" as the override character instead of "_".

(From OE-Core rev: 42344347be29f0997cc2f7636d9603b1fe1875ae)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/packagegroups/packagegroup-core-tools-testapps.bb

@@ -12,14 +12,14 @@ inherit packagegroup
 
 # kexec-tools doesn't work on e5500-64b, microblaze and nios2 yet
 KEXECTOOLS ?= "kexec"
-KEXECTOOLS_e5500-64b ?= ""
-KEXECTOOLS_microblaze ?= ""
-KEXECTOOLS_nios2 ?= ""
-KEXECTOOLS_riscv64 ?= ""
-KEXECTOOLS_riscv32 ?= ""
+KEXECTOOLS:e5500-64b ?= ""
+KEXECTOOLS:microblaze ?= ""
+KEXECTOOLS:nios2 ?= ""
+KEXECTOOLS:riscv64 ?= ""
+KEXECTOOLS:riscv32 ?= ""
 
 GSTEXAMPLES ?= "gst-examples"
-GSTEXAMPLES_riscv64 = ""
+GSTEXAMPLES:riscv64 = ""
 
 X11GLTOOLS = "\
     mesa-demos \
@@ -37,7 +37,7 @@ X11TOOLS = "\
     xprop \
     "
 
-RDEPENDS_${PN} = "\
+RDEPENDS:${PN} = "\
     blktool \
     ${KEXECTOOLS} \
     alsa-utils-amixer \