Revert "mb/google/rex: Enable VPU"

This reverts commit 555ceca38a78 ("mb/google/rex: Enable VPU").

Reason: Unable to boot to latest OS image with VPU enabled.

BUG=none
TEST=Boot to OS image 15376 on google/rex

Change-Id: If61282528922304373d492b362056b52995cbcad
Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73694
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Paz Zcharya <pazz@google.com>
Reviewed-by: Tarun Tuli <taruntuli@google.com>
diff --git a/src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb b/src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb
index d328046..9a71e95 100644
--- a/src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb
+++ b/src/mainboard/google/rex/variants/baseboard/rex/devicetree.cb
@@ -56,7 +56,6 @@
 	device domain 0 on
 		device ref igpu on end
 		device ref dtt on end
-		device ref vpu on end
 		device ref xhci on end
 		device ref shared_sram on end
 		device ref heci1 on end