Makefile: Suppress unwanted 'echo' output
Makefile: Suppress unwanted 'echo' output

Add a 'echo' command which can be called to generate output. If V=0 then
it is suppressed. This drops the unwanted output when V=0.

Signed-off-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>
BUG=chromium:680243
BRANCH=none
TEST=V=0 emerge-reef chromeos-ec; See that the BUILD lines are gone

Change-Id: Ie4474024c84345d427f4d95a9ff194dc740f860f
Reviewed-on: https://chromium-review.googlesource.com/427364
Commit-Ready: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>
Tested-by: Simon Glass <c00b0378376498bd9cd974c388df8854c0131d27@chromium.org>
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec