soc/intel/alderlake: Define Kconfigs for Descriptor Region

The patch defines Kconfigs for FMAP Descriptor Region and Descriptor
Region size. The Kconfigs will be used by follow-up patches.

TEST=Build Brya code

Signed-off-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Change-Id: Ia3481acefbda885617607675aef2afbb81c21c77
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62263
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Reviewed-by: Krishna P Bhat D <krishna.p.bhat.d@intel.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/soc/intel/alderlake/Kconfig

@@ -368,4 +368,16 @@ config CSE_BPDT_VERSION
 
 endif
 
+config SI_DESC_REGION
+	string "Descriptor Region name"
+	default "SI_DESC"
+	help
+	  Name of Descriptor Region in the FMAP
+
+config SI_DESC_REGION_SZ
+	int
+	default 4096
+	help
+	  Size of Descriptor Region in the FMAP
+
 endif