Add clean up for 4.7 and missing 4.7 toolchain reference

Change-Id: Id731b46594e0d2897a949d9ff688cbd08346aecb

Conflicts:
	CleanSpec.mk
Revert "build: Relax Cortex CFLAGS"

This reverts commit 90e13bc8a703d1f7807cee7b1d11f399e8d494b4.