commonlib: Simplify FSP header inclusion

Include `fsp_header.h` from vendorcode for dynamic FSP_INFO_HEADER
selection.

BUG=b:242829490
TEST=google/rex0 builds successfully with 64-bit FSP.

Change-Id: If165e0517752f320d898cf82f298aa9f5699ae86
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81624
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/commonlib/fsp_relocate.c

@@ -4,24 +4,11 @@
 #include <commonlib/endian.h>
 #include <commonlib/fsp.h>
 #include <inttypes.h>
-/*
- * Intel's code does not have a handle on changing global packing state.
- * Therefore, one needs to protect against packing policies that are set
- * globally for a compilation unit just by including a header file.
- */
-#pragma pack(push)
-
-/* Default bind FSP 1.1 API to edk2 UEFI 2.4 types. */
-#include <vendorcode/intel/edk2/uefi_2.4/uefi_types.h>
-#include <vendorcode/intel/fsp/fsp1_1/IntelFspPkg/Include/FspInfoHeader.h>
-
-/* Restore original packing policy. */
-#pragma pack(pop)
-
 #include <commonlib/helpers.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
+#include <vendorcode/intel/fsp/fsp_header.h>
 
 #define FSP_DBG_LVL BIOS_NEVER
 #define MASK_24BITS  0x00FFFFFF