soc/intel/jasperlake: Disable multiphase SI init

Jasper Lake does not have any use case for multiphase SI init so
Disable it.

BUG=b:162184827
BRANCH=None
TEST=Build and boot JSLRVP

Cq-Depend: chrome-internal:3221772
Change-Id: I2d591b46c403e68ff0b41ac8f87c742ae774111e
Signed-off-by: Ronak Kanabar <ronak.kanabar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43816
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>

src/soc/intel/jasperlake/fsp_params.c

@@ -349,6 +349,12 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 	mainboard_silicon_init_params(params);
 }
 
+/* Disable Multiphase Si init */
+int soc_fsp_multi_phase_init_is_enable(void)
+{
+	return 0;
+}
+
 /* Mainboard GPIO Configuration */
 __weak void mainboard_silicon_init_params(FSP_S_CONFIG *params)
 {