feat(board/rdedmunds): add support for rdedmunds variant

Add initial support for RD-Edmunds platform. This platform is considered
as a variant of RD-N2 platform with only major change being the CPU
which is Demeter instead of Neoverse-N2.

Signed-off-by: Tony K Nadackal <tony.nadackal@arm.com>
Change-Id: I939d9eac652fa9e76ad002ee5e6107aa79baa013
diff --git a/plat/arm/css/sgi/include/sgi_variant.h b/plat/arm/css/sgi/include/sgi_variant.h
index 0062b97..41467f7 100644
--- a/plat/arm/css/sgi/include/sgi_variant.h
+++ b/plat/arm/css/sgi/include/sgi_variant.h
@@ -23,6 +23,10 @@
 /* SID Version values for RD-N2 variants */
 #define RD_N2_CFG1_SID_VER_PART_NUM		0x07B6
 
+/* SID Version values for RD-Edmunds */
+#define RD_EDMUNDS_SID_VER_PART_NUM		0x07F2
+#define RD_EDMUNDS_CONFIG_ID			0x1
+
 /* Structure containing SGI platform variant information */
 typedef struct sgi_platform_info {
 	unsigned int platform_id;	/* Part Number of the platform */