sb/lynxpoint/gpio: fix interrupt storm

On newer kernels (> 4.9 LTS), the GPIO ACPI device's interrupt
resource causes an interrupt storm which prevents the CPU
from properly idling, significantly increasing power consumption.
This was fixed for soc/broadwell (which also supports lynxpoint-lp)
by removing the interrupt resource, so apply the same fix here.

Original fix: https://chromium-review.googlesource.com/203645

Test: build/boot google/wolf, verify CPU0 idles correctly and
power consumption drop via powertop in kernels 4.16.18 and 5.x.

Change-Id: Ic4963f2f0225b5f44a7604b0107911640345c855
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39578
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/southbridge/intel/lynxpoint/acpi/serialio.asl

@@ -551,8 +551,9 @@ Device (GPIO)
 			,            // ResourceSourceIndex
 			,            // ResourceSource
 			BAR0)
-		Interrupt (ResourceConsumer,
-			Level, ActiveHigh, Shared, , ,) {14}
+		// Disabled due to IRQ storm: http://crosbug.com/p/29548
+		//Interrupt (ResourceConsumer,
+		//	Level, ActiveHigh, Shared, , , ) {14}
 	})
 
 	Method (_CRS, 0, NotSerialized)