vendorcode/intel/fsp: Add FSP header file for Alder Lake N FSP v2503_00

The headers added are generated as per Alder Lake N FSP v2503_00.
Changes include:
- Add all header files for Alder Lake N FSP.
- List of header files: FirmwareVersionInfoHob.h, FspmUpd.h, FspsUpd.h,
  FspUpd.h, MemInfoHob.h
- Select FSP_HEADER_PATH

BUG=b:213828776
BRANCH=None

Change-Id: I97afa6d47cc825703a8dc82216250bfc5e09dc9b
Signed-off-by: Ronak Kanabar <ronak.kanabar@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61547
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Reviewed-by: Kangheui Won <khwon@chromium.org>
diff --git a/src/soc/intel/alderlake/Kconfig b/src/soc/intel/alderlake/Kconfig
index 863150e..1b20cf8 100644
--- a/src/soc/intel/alderlake/Kconfig
+++ b/src/soc/intel/alderlake/Kconfig
@@ -319,6 +319,7 @@
 
 config FSP_HEADER_PATH
 	string "Location of FSP headers"
+	default "src/vendorcode/intel/fsp/fsp2_0/alderlake_n/" if SOC_INTEL_ALDERLAKE_PCH_N
 	default "src/vendorcode/intel/fsp/fsp2_0/alderlake/"
 
 config FSP_FD_PATH