ec/google/chromeec: set DPTC power parameter at OS startup

set DPTC power parameter per clamshell/tablet mode
after EC OP region is accessible.

BUG=b:157943445
BRANCH=zork
TEST=1. emerge-zork coreboot
     2. power on DUT in tablet mode then check "thermctl_limit"
        will change automatically

Change-Id: Ic3e1119881790c34f5649986334b4e3cecafc02b
Signed-off-by: Kevin Chiu <kevin.chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45580
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/ec/google/chromeec/acpi/ec.asl

@@ -159,6 +159,17 @@ Device (EC0)
 
 		// Initialize LID switch state
 		Store (LIDS, \LIDS)
+
+#ifdef EC_ENABLE_AMD_DPTC_SUPPORT
+		/*
+		 * Per the device mode (clamshell or tablet) to initialize
+		 * the thermal setting on OS startup.
+		 */
+		If (CondRefOf (\_SB.DPTC)) {
+			\_SB.DPTC()
+		}
+#endif
+
 	}
 
 	/* Read requested temperature and check against EC error values */