util/mb/google: add templates for puff boards

Add template directory for the Puff reference board.

BUG=b:157701044
BRANCH=None
TEST=N/A

Signed-off-by: Paul Fagerburg <pfagerburg@chromium.org>
Change-Id: Ic81c663b92eeb1d39c2b425d331eb16812f58b7d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42026
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sam McNally <sammc@google.com>

util/mainboard/google/puff/template/overridetree.cb

@@ -0,0 +1,6 @@
+chip soc/intel/cannonlake
+
+	device domain 0 on
+	end
+
+end