There wasn't an equivalent to align down so add ALIGN_DOWN.
For symmetry provide an ALIGN_UP macro as well.
Change-Id: I7033109311eeb15c8c69c649878785378790feb9
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2951
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>