cros_boot_mode: Updating common.mk to ToT to enable profiling

This update replaces the current common.mk used in this project with the newest
version. This will allow all of the common.mk based projects to be on the same
version for debugging and enables profiling support.

Rewrote the Makefile to use more of the functionality provided by common.mk.

BUG=chromium-os:37854
TEST=Exectuted the following commands to confirm the build works:
     MODE=profiling cros_workon_make --board=link
     MODE=profiling cros_workon_make --board=link --test
     cros_workon_make --board=link
     cros_workon_make --board=link --test
     Repeated these with emerge-link, USE=profiling, and
     FEATURES=test as need.
     For the emerge command with profiling and testing enable, confirmed the
     appropriate coverage files were created in /usr/share/profiling/...

Change-Id: Ie8b748e149b82cd8e3797098d710e7c51f9a26a2
Reviewed-on: https://gerrit.chromium.org/gerrit/42785
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Tested-by: Ryan Harrison <rharrison@chromium.org>
2 files changed