soc/intel/common/block/cpu: Add option to skip coreboot AP init

SoC users from IOTG team is looking forward for a solution to skip
coreboot AP initialization flow and make use of FSPS-UPD to
perform AP reset.

TEST=Assign use_fsp_mp_init=1 to ensure coreboot is not bringing APs
out of reset.

Change-Id: Ibc8cd411e802fb682436a933073922b2693ba994
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/26644
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/skylake/chip.h

@@ -433,13 +433,6 @@ struct soc_intel_skylake_config {
 		SERIAL_IRQ_FRAME_PULSE_8CLK = 2,
 	} SerialIrqConfigStartFramePulse;
 
-	/*
-	 * Option for mainboard to skip coreboot MP initialization
-	 * 0 = Make use of coreboot MP Init
-	 * 1 = Make use of FSP MP Init
-	 */
-	u8 use_fsp_mp_init;
-
 	/*
 	 * VrConfig Settings for 5 domains
 	 * 0 = System Agent, 1 = IA Core, 2 = Ring,