AndroidBoot.mk: adjust for PATH changes in Android Q

$(MAKE) isn't valid anymore, so use $(KERNEL_MAKE_CMD) instead.

Additionally we need to provide the full path to the compiler, as gcc
isn't present in the PATH anymore

This commit only touches the targets for the make targets that are
actually used.

Issue: FP2A10-18
Change-Id: I3eae6cf1ff0dcb33487e64da87dfcaf9249464ea
1 file changed