mb/google/rex/var/deku: Update psys_pmax_watt value to 180W

Adjust setting is from power team.
Change from 172W to 180W

BUG=b:320410462
BRANCH=firmware-rex-15709.B
TEST= FSP debug emerge-ovis coreboot intel-mtlfsp
      check overrides setting

Change-Id: Icc8b12adc9fb9f680b05131c8d41212865223ca9
Signed-off-by: Tony Huang <tony-huang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82178
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>

src/mainboard/google/rex/variants/deku/overridetree.cb

@@ -54,6 +54,8 @@ chip soc/intel/meteorlake
 		},
 	}"
 
+	register "psys_pmax_watts" = "180"
+
 	# As per doc 640982, Intel MTL-U 28W CPU supports FVM on GT and SA
 	# The ICC Limit is represented in 1/4 A increments, i.e., a value of 400 = 100A
 	# For GT VR configuration