xilinx-standalone: When building for cortexr5, add -DARMR5 for CCARGS
The embeddedsw expects -DARMR5 when building for a cortexr5.  Enable this
globally within the distribution configuration.  This ensures that the
tunings remain generic.
@@ -20,3 +20,6 @@ LIBC_DEPENDENCIES_append = " newlib-staticdev libgloss-staticdev"
ESW_CFLAGS ?= ""
INHERIT += "buildhistory"
+
+# Cortex R5 requires an additional cflag to be passed for compatibility with the embeddedsw
+TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'cortexr5', ' -DARMR5', '', d)}"
