soc/intel/*: drop useless XTAL shutdown qualification code

The XTAL shutdown (dis)qualification bit already unconditionally gets
set to 1 by FSP for these platforms, making this code redundant.

Change-Id: I7fa4afb0de2af1814e5b91c152d82d7ead310338
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46016
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/finalize.c

@@ -73,10 +73,6 @@ static void pch_finalize_script(struct device *dev)
 	if (config->PmTimerDisabled)
 		pmc_disable_acpi_timer();
 
-	/* Disable XTAL shutdown qualification for low power idle. */
-	if (config->s0ix_enable)
-		pmc_ignore_xtal_shutdown();
-
 	/* we should disable Heci1 based on the devicetree policy */
 	if (config->HeciEnabled == 0)
 		pch_disable_heci();