coreboot: add Volteer template files

Add template files for making a new barebones-copy of Volteer.

BUG=b:147483699
BRANCH=None
TEST=N/A

Change-Id: I8cc69b8ce7dbc6809de058019bdc466a060069e7
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39462
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>

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

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