google/cyan: Fix ACPI resource scope for Melfas touchscreen

Fix scope of ResourceSource, which should match the scope of the
device itself.

Change-Id: I9d0ff0ecc2721ec55b1ed12dddb495cd55966daf
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/28114
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/google/cyan/acpi/touchscreen_melfas.asl

@@ -33,7 +33,7 @@ Scope (\_SB.PCI0.I2C1)
 					ControllerInitiated,      /* SlaveMode */
 					400000,                   /* ConnectionSpeed */
 					AddressingMode7Bit,       /* AddressingMode */
-					"\\_SB.I2C1",             /* ResourceSource */
+					"\\_SB.PCI0.I2C1",        /* ResourceSource */
 				)
 				GpioInt (Level, ActiveLow, ExclusiveAndWake, PullDefault,,
  					"\\_SB.GPNC") { BOARD_TOUCH_GPIO_INDEX }