armv7: added paranoia for cache library

This adds some paranoia to cache manipulation routines:
- "memory" is added to the clobber list for functions which clean
  and/or invalidate dcache or TLB entries.
- Remove unneeded clobber list for read_sctlr()

Change-Id: Iaa82ef78bfdad4119f097c3b6db8219f29f832bc
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2928
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
1 file changed