skylake: Update the thermal time window for throttling action

This patch reduces the thermal time window to 100 milliseconds
for fast throttling action at prochot.

BUG=chrome-os-partner:59397
BRANCH=None.
TEST=Built for skylake platform and verified the thermal time
window value.

Change-Id: If79d213cb8e19277ffdb882267d2f8672df93446
Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-on: https://review.coreboot.org/17384
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/skylake/cpu.c

@@ -205,6 +205,10 @@ static void configure_thermal_target(void)
 		msr.lo |= (conf->tcc_offset & 0xf) << 24;
 		wrmsr(MSR_TEMPERATURE_TARGET, msr);
 	}
+	msr = rdmsr(MSR_TEMPERATURE_TARGET);
+	msr.lo &= ~0x7f; /* Bits 6:0 */
+	msr.lo |= 0xe6; /* setting 100ms thermal time window */
+	wrmsr(MSR_TEMPERATURE_TARGET, msr);
 }
 
 static void configure_isst(void)