google/lars: Enable wake from touch pad

This patch enables GPP_B5 as ACPI_SCI for wake.
It also defines touchpad wake device in ACPI with GPE0_DW0_05 for _PRW.

BUG=none
BRANCH=none
TEST=emerge-lars coreboot

Change-Id: I2b65f6a37783ecdbdbc32ebe613243e042c865e9
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: ec5b629f920984564f12f2c09458ed300d031f69
Original-Change-Id: I9bd2b3595ae833fa5d07d97a7cda4a29041be837
Original-Signed-off-by: David Wu <David_Wu@quantatw.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/311890
Original-Commit-Ready: David Wu <david_wu@quantatw.com>
Original-Tested-by: David Wu <david_wu@quantatw.com>
Original-Reviewed-by: Shawn N <shawnn@chromium.org>
Reviewed-on: http://review.coreboot.org/12449
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/google/lars/acpi/mainboard.asl

@@ -124,6 +124,8 @@ Scope (\_SB.PCI0.I2C1)
 			}
 		})
 
+		Name (_PRW, Package() { GPE_TOUCHPAD_WAKE, 0x3 })
+
 		Method (_STA)
 		{
 			Return (0xF)

src/mainboard/google/lars/gpio.h

@@ -38,6 +38,9 @@
 /* GPP_B16 is WLAN_WAKE. GPP_B group is routed to DW0 in the GPE0 block */
 #define GPE_WLAN_WAKE		GPE0_DW0_16
 
+/* GPP_B5 is TOUCHPAD WAKE. GPP_B group is routed to DW0 in the GPE0 block */
+#define GPE_TOUCHPAD_WAKE       GPE0_DW0_05
+
 /* Input device interrupt configuration */
 #define TOUCHPAD_INT_L		GPP_B3_IRQ
 #define TOUCHSCREEN_INT_L	GPP_E7_IRQ
@@ -79,7 +82,7 @@ static const struct pad_config gpio_table[] = {
 /* HSJ_MIC_DET */	PAD_CFG_GPI(GPP_B2, NONE, DEEP),
 /* TRACKPAD_INT */	PAD_CFG_GPI_APIC(GPP_B3, NONE, DEEP),
 /* BT_RF_KILL */	PAD_CFG_GPO(GPP_B4, 0, DEEP),
-/* SRCCLKREQ0# */	/* GPP_B5 */
+/* SRCCLKREQ0# */	PAD_CFG_GPI_ACPI_SCI(GPP_B5, NONE, DEEP, YES), /* TOUCHPAD WAKE */
 /* WIFI_CLK_REQ */	PAD_CFG_NF(GPP_B6, NONE, DEEP, NF1),
 /* KEPLR_CLK_REQ */	PAD_CFG_NF(GPP_B7, NONE, DEEP, NF1),
 /* SRCCLKREQ3# */	/* GPP_B8 */