Get rid of common.h, use stddef.h instead where needed

common.h is leftover from ancient times. Mosys-specific #defines
now live in mosys.h, which leaves an unused enum and some macros
which overlap stddef.h remaining.

BUG=none
BRANCH=none
TEST=Compiled for rambi (x86), storm (arm), and mipsel-o32-generic

Change-Id: I07ad61e03f734abaf68b470488875858c428e88b
Reviewed-on: https://chromium-review.googlesource.com/225670
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
5 files changed