mb/google/sarien: Remove power button ACPI device

These platforms use the standard fixed function power button
and do not need a second power button device declared or the
kernel will end up with two devices reporting the same event.

Change-Id: I6fe2b201a6a6f6307a0c4bd6a61f56cfcdd88bf4
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/30720
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>

src/mainboard/google/sarien/dsdt.asl

@@ -35,10 +35,6 @@ DefinitionBlock(
 	#include <cpu/intel/common/acpi/cpu.asl>
 
 	Scope (\_SB) {
-		Device (PWRB)
-		{
-			Name (_HID, EisaId ("PNP0C0C"))
-		}
 		Device (PCI0)
 		{
 			#include <soc/intel/cannonlake/acpi/northbridge.asl>