mb/asrock/b85m_pro4: Disable PS/2 keyboard wakeup

This results in a wake from S5 as well. Since the PS/2 keyboard now
works, this behavior is annoying and, therefore, undesired.

Change-Id: I180f17c87df23f2a1bbd5c968c64a4b2bc7d9978
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42431
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/asrock/b85m_pro4/devicetree.cb

@@ -96,7 +96,6 @@ chip northbridge/intel/haswell
 						irq 0xe0 = 0xff		# + GPIO7 direction
 					end
 					device pnp 2e.a   on		# ACPI
-						irq 0xe0 = 0x41		# + Enable KBC wakeup
 						irq 0xe4 = 0x10		# + Power RAM in S3
 						irq 0xf0 = 0x20
 					end