cpu/x86/smm/smm_module_loaderv2.c: Rename file

As v1 was dropped, rename v2.

Change-Id: I4dd51804e9391284c7624c42ad8180a14b1a4c84
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51528
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/cpu/x86/smm/Makefile.inc

@@ -1,6 +1,6 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
-ramstage-y += smm_module_loaderv2.c
+ramstage-y += smm_module_loader.c
 ramstage-y += smi_trigger.c
 
 ifeq ($(CONFIG_ARCH_RAMSTAGE_X86_32),y)