util/mb/google: add support for nissa

Add the file template for creating a new variant of Nissa.

BUG=b:229550821

Signed-off-by: Shou-Chieh Hsu <shouchieh@google.com>
Change-Id: I04f75ff91f9851b82641f703ba950b04c22e2e72
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64045
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>

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

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