mb/asrock/b85m_pro4: Correct GP01 output level

This allows the CPU fan tach signal to reach the Super I/O.

Change-Id: Ibf73d7c7c1951b75ee4e0c731caf951f2c6bfcae
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42402
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/asrock/b85m_pro4/devicetree.cb

@@ -79,7 +79,7 @@ chip northbridge/intel/haswell
 					device pnp 2e.8   off end	# WDT
 					device pnp 2e.108 on		# GPIO0
 						irq 0xe0 = 0xf9		# + GPIO0 direction
-						irq 0xe1 = 0xfb		# + GPIO0 value
+						irq 0xe1 = 0xfd		# + GPIO0 value
 					end
 					device pnp 2e.208 off end	# GPIOA
 					device pnp 2e.308 off end	# GPIO base