auron: Add _PRW for LID0 ACPI Device

The kernel will not track wakeup events for devices unless they have
a defined _PRW.  There is no EC output of the lid signal coming to
a GPIO and instead it pulses WAKE#.  There is no actual GPE for
WAKE# so pretend that PCI_EXP is the right GPE.

From the EDS: "WAKE# is treated as a wake event, but does not cause
any bits to go active in the GPE_STS register."

BUG=chromium:427769
BRANCH=none
TEST=manual on auron
- Run lidclose + lidopen in rapid succession, verify that suspend
  request is aborted.

Change-Id: I116f3b98f5f31f3ded7c6b403ffa35724176a52d
Signed-off-by: Wei Shun Chang <wei.shun.chang@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/226160
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/mainboard/google/auron/acpi/mainboard.asl

@@ -31,6 +31,11 @@ Scope (\_SB)
 			Store (\_SB.PCI0.LPCB.EC0.LIDS, \LIDS)
 			Return (\LIDS)
 		}
+
+
+		// There is no GPIO for LID, the EC pulses WAKE# pin instead.
+		// There is no GPE for WAKE#, so fake it with PCI_EXP_WAKE
+		Name (_PRW, Package(){ 0x69, 5 }) // PCI_EXP
 	}
 
 	Device (PWRB)