armv7/arm64: remove timestamp.c

The src/lib/timestamp.c already has an implementation using
timer_monotonic_get() for timestamp_get(). Use that instead
of duplicating the logic.

BUG=chrome-os-partner:44669
BRANCH=None
TEST=None

Change-Id: If17be86143f217445bd64d67ceee4355fa482d39
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11468
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
4 files changed