cpu/smm_module_loader.c: Fix up CPU index locally

Don't pass the stub params to the mp_init code.

Change-Id: I070bc00ae5e5bceb6c5b90ea833cc057dd41f6cc
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64802
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/include/cpu/x86/smm.h

@@ -156,8 +156,6 @@ struct smm_loader_params {
 	size_t num_concurrent_save_states;
 
 	smm_handler_t handler;
-
-	struct smm_stub_params *stub_params;
 };
 
 /* All of these return 0 on success, < 0 on failure. */