drivers/intel/fsp1_0: Deduplicate code

Move ChipsetFspReturnPoint() to drivers/intel/fsp1_0.

Allows to have a common entry after FSP-M.

Change-Id: I064ae67041c521ee92877cff30c814fce7b08e1f
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31713
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: David Guckian
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Jay Talbott <JayTalbott@sysproconsulting.com>

src/southbridge/intel/fsp_rangeley/romstage.h

@@ -29,6 +29,4 @@ void early_mainboard_romstage_entry(void);
 void late_mainboard_romstage_entry(void);
 void get_func_disables(uint32_t *mask);
 
-void romstage_main_continue(EFI_STATUS status, void *hob_list_ptr);
-
 #endif /* _RANGELEY_ROMSTAGE_H_ */