ec: Add .gitmessage to .gitignore
ec: Add .gitmessage to .gitignore

Add the optional commit message template file to .gitignore.
See https://crbug.com/gerrit/10963 for details.

BRANCH=none
BUG=none
TEST=none

Signed-off-by: Andrea Grandi <f017805e76e0e7a74072a3bac1b6e29e65eedeab@google.com>
Change-Id: Ic8939bc7202c8a09c76e472b2884773ac34451ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3508713
Reviewed-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>

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