AMD Kabini: fix issue 'S3 fails to suspend after wake up from USB keyboard'

Propagated from
http://review.coreboot.org/3347
http://review.coreboot.org/3374

The cause of this issue is:
USB devices use bit 11(0x0b) of GP0_STS represents S3 wake up event,
but this bit is not clear after wake up. So OS thinks there is a
wake up signal and wake up immediately.

Both amd/olivehill and asrock/imb-a180 have been validated.

Change-Id: I7c26cb07bcd2e62bb792809b67314e5155c6adf6
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/4261
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/mainboard/amd/olivehill/acpi/mainboard.asl

@@ -32,3 +32,10 @@ Name(SSFG, 0x0D)		/* S1 support: bit 0, S2 Support: bit 1, etc. S0 & S5 assumed
 Name(OSTP, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
 Name(OSV, Ones)	/* Assume nothing */
 Name(PMOD, One)	/* Assume APIC */
+
+/* AcpiGpe0Blk */
+OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
+	Field(GP0B, ByteAcc, NoLock, Preserve) {
+	, 11,
+	USBS, 1,
+}

src/mainboard/amd/olivehill/acpi/sleep.asl

@@ -89,6 +89,8 @@ Method(\_WAK, 1) {
 	/* DBGO("From S") */
 	/* DBGO(Arg0) */
 	/* DBGO(" to S0\n") */
+	Store(1,USBS)
+
 	\_SB.AWAK(Arg0)
 
 	Return(WKST)

src/mainboard/asrock/imb-a180/acpi/mainboard.asl

@@ -32,3 +32,10 @@ Name(SSFG, 0x0D)		/* S1 support: bit 0, S2 Support: bit 1, etc. S0 & S5 assumed
 Name(OSTP, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
 Name(OSV, Ones)	/* Assume nothing */
 Name(PMOD, One)	/* Assume APIC */
+
+/* AcpiGpe0Blk */
+OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
+	Field(GP0B, ByteAcc, NoLock, Preserve) {
+	, 11,
+	USBS, 1,
+}

src/mainboard/asrock/imb-a180/acpi/sleep.asl

@@ -89,6 +89,8 @@ Method(\_WAK, 1) {
 	/* DBGO("From S") */
 	/* DBGO(Arg0) */
 	/* DBGO(" to S0\n") */
+	Store(1,USBS)
+
 	\_SB.AWAK(Arg0)
 
 	Return(WKST)