soc/intel/cannonlake/acpi: Add board level s0ix call back

Add board level s0ix call back. Since some driver doesn't
care _ON/_OFF method. Add a control method for s0ix usage.

BUG=b:129177593
TEST=NA

Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I404f388b19355ae89b36d1fb07f9fb4f97eb3b2d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32539
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/cannonlake/acpi/lpit.asl

@@ -14,6 +14,8 @@
  * GNU General Public License for more details.
  */
 
+External(\_SB.MS0X, MethodObj)
+
 scope(\_SB)
 {
 	Device(LPID) {
@@ -62,12 +64,20 @@ scope(\_SB)
 			 */
 			If(Arg2 == 5) {
 				\_SB.PCI0.LPCB.EC0.S0IX(1)
+				/* provide board level s0ix hook */
+				If (CondRefOf (\_SB.MS0X)) {
+					\_SB.MS0X(1)
+				}
 			}
 			/*
 			 * Function 6.
 			 */
 			If(Arg2 == 6) {
 				\_SB.PCI0.LPCB.EC0.S0IX(0)
+				/* provide board level s0ix hook */
+				If (CondRefOf (\_SB.MS0X)) {
+					\_SB.MS0X(0)
+				}
 			}
 		}
 		Return(Buffer(One) {0x00})