soc/intel/{apollolake, cannonlake, common, skylake}: Add _soc_ prefix in weak function

This patch ensures all soc function name is having _soc_ prefix
in it.

TEST=Able to compile SMM common code for all supported SOC.

Change-Id: Iab1b2f51eaad87906e35dbb9e90272590974e145
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/22973
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/cannonlake/smihandler.c

@@ -25,7 +25,7 @@ const struct smm_save_state_ops *get_smm_save_state_ops(void)
 	return &em64t101_smm_ops;
 }
 
-void smihandler_check_illegal_access(uint32_t tco_sts)
+void smihandler_soc_check_illegal_access(uint32_t tco_sts)
 {
 	if (!((tco_sts & (1 << 8)) && IS_ENABLED(CONFIG_SPI_FLASH_SMM)
 			&& fast_spi_wpd_status()))
@@ -46,7 +46,7 @@ void smihandler_check_illegal_access(uint32_t tco_sts)
 }
 
 /* SMI handlers that should be serviced in SCI mode too. */
-uint32_t smi_handler_get_sci_mask(void)
+uint32_t smihandler_soc_get_sci_mask(void)
 {
 	uint32_t sci_mask =
 		SMI_HANDLER_SCI_EN(APM_STS_BIT) |