soc/intel/common/timer: Move USE_LEGACY_8254_TIMER into common/block/timer

This patch moves USE_LEGACY_8254_TIMER Kconfig into common/block/timer
for better code sharing. Also ported CB:33512 for SPT and ICP PCH.

Change-Id: Ic767ff97aaa3eb7fa35ffa38fa416d006eaa6e78
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34132
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/skylake/chip.h

@@ -513,9 +513,6 @@ struct soc_intel_skylake_config {
 	/* Enable/Disable host reads to PMC XRAM registers */
 	u8 PchPmPmcReadDisable;
 
-	/* Statically clock gate 8254 PIT. */
-	u8 clock_gate_8254;
-
 	/*
 	 * Use SD card detect GPIO with default config:
 	 * - Edge triggered