arch/x86: Rename some mainboard_romstage_entry()

These platforms use different signature for this function, so
declare them with different name to make room in global namespace.

Change-Id: I77be9099bf20e00ae6770e9ffe12301eda028819
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34909
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/baytrail/include/soc/romstage.h

@@ -28,7 +28,7 @@ struct romstage_params {
 	struct mrc_params *mrc_params;
 };
 
-void mainboard_romstage_entry(struct romstage_params *params);
+void mainboard_romstage_entry_rp(struct romstage_params *params);
 void romstage_common(struct romstage_params *params);
 
 void raminit(struct mrc_params *mp, int prev_sleep_state);

src/soc/intel/baytrail/romstage/romstage.c

@@ -146,7 +146,7 @@ static void romstage_main(uint64_t tsc)
 	gfx_init();
 
 	/* Call into mainboard. */
-	mainboard_romstage_entry(&rp);
+	mainboard_romstage_entry_rp(&rp);
 
 	if (CONFIG(SMM_TSEG))
 		smm_list_regions();