mainboard/google/gru: Add license header to memlayout.ld

I missed this license header, and it's causing a build breakage.

Change-Id: If472e5c081bd282f0b482af629d6ec2314a2c329
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14388
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Tested-by: build bot (Jenkins)
1 file changed