mb/google/fizz/variants/karma: Increase Pmax to 151 for all SKUs

Needs to increase ROPmax to 80W (includes both panel and audio),
hence the Pmax = 71W (PL4) + 80W (ROPmax) = 151W.

BUG=b:119644629
BRANCH=master
TEST=USE=fw_debug emerge-kalista chromeos-mrc coreboot chromeos-bootimage
         & ensure the Pmax value is passed to FSP-S.

Change-Id: I504ff66a218bf4e385270c2cb385a83dca312a81
Signed-off-by: David Wu <David_Wu@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/29654
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/fizz/variants/karma/overridetree.cb

@@ -7,6 +7,7 @@ chip soc/intel/skylake
 	#| Touchsreen     |   10  |                                   |
 	#+----------------+-------+-----------------------------------+
 	register "usb2_ports[9]" = "USB2_PORT_MID(OC_SKIP)"	# Touchscreen
+	register "psys_pmax" = "151"
 
 	device domain 0 on
 		device pci 14.0 on