southbridge/bd82x6x - add GNVS var for trackpad IRQ

Add a GNVS variable to store trackpad IRQ for google/parrot, so
that both SNB and IVB variants can be built with the same config

Change-Id: I232da4077e3400b8ef2520dc33fd770c731b7ec3
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/20092
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/southbridge/intel/bd82x6x/acpi/globalnvs.asl

@@ -175,6 +175,7 @@ Field (GNVS, ByteAcc, NoLock, Preserve)
 	ALFP,	 8,	// 0xf2 - active lfp
 	IMON,	 8,	// 0xf3 - current graphics turbo imon value
 	MMIO,	 8,	// 0xf4 - 64bit mmio support
+	TPIQ,	 8,	// 0xf5 - trackpad IRQ value
 
 	/* ChromeOS specific */
 	Offset (0x100),

src/southbridge/intel/bd82x6x/nvs.h

@@ -145,7 +145,8 @@ typedef struct {
 	u8	alfp; /* 0xf2 - active lfp */
 	u8	imon; /* 0xf3 - current graphics turbo imon value */
 	u8	mmio; /* 0xf4 - 64bit mmio support */
-	u8	rsvd13[11]; /* 0xf5 - rsvd */
+	u8	tpiq; /* 0xf5 - trackpad IRQ value */
+	u8	rsvd13[10]; /* 0xf6 - rsvd */
 
 	/* ChromeOS specific (starts at 0x100)*/
 	chromeos_acpi_t chromeos;