Slight tweak to Makefile

Replacing a few duplicated items with a single definition, removing a couple
of unnecessary/redundant dependencies.

BUG=chromium:224734
BRANCH=ToT
TEST=make runtests

Change-Id: I31e78ae1e3810865e26c9c4937eb44222cbfa9d6
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/207741
1 file changed