mb/google/volteer: Create Malefor variant

This commit creates a malefor variant for Volteer. The initial settings
override the baseboard was copied from variant ripto. Fine tune GPIO
and memory DQ based on malefor schematics.

BUG=b:150653745
BRANCH=volteer
TEST=emerge-volteer coreboot

Signed-off-by: William Wei <wenxu.wei@bitland.corp-partner.google.com>
Change-Id: Idbeebb13e537287686344740211143df35b7863a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39857
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/volteer/variants/malefor/overridetree.cb b/src/mainboard/google/volteer/variants/malefor/overridetree.cb
new file mode 100644
index 0000000..32204c5
--- /dev/null
+++ b/src/mainboard/google/volteer/variants/malefor/overridetree.cb
@@ -0,0 +1,6 @@
+chip soc/intel/tigerlake
+
+	device domain 0 on
+	end
+
+end