soc/intel/alderlake: Add BUILDING_WITH_DEBUG_FSP

Intel FSP has "debug" build which is not public, used for debugging by
approved developers. Add a Kconfig to indicate that coreboot is building
with debug version of FSP so we can adjust few things (i.e. flash
layout) in the case.

Signed-off-by: Kangheui Won <khwon@chromium.org>
Change-Id: Ibc561498d7edcb9d7ec155f090822f1eb25d10cd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65466
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Reka Norman <rekanorman@chromium.org>

src/soc/intel/alderlake/Kconfig

@@ -433,4 +433,10 @@ config SI_DESC_REGION_SZ
 	help
 	  Size of Descriptor Region in the FMAP
 
+config BUILDING_WITH_DEBUG_FSP
+	bool "Debug FSP is used for the build"
+	default n
+	help
+	  Set this option if debug build of FSP is used.
+
 endif