feat(rdfremont): update Root registers page offset for SMMUv3

SMMUv3 with RME on RD-Fremont platform variants supports Root and Realm
register pages. The page offset for Root and Realm register pages is a
platform configurable option. Update the Root registers page offset for
RD-Fremont platform variants.

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Signed-off-by: Vivek Gautam <vivek.gautam@arm.com>
Change-Id: Ib3df7d7b9e54219d49b4d77a1fc5846096f1c78c

plat/arm/board/neoverse_rd/common/include/nrd3/nrd_plat_arm_def3.h

@@ -361,6 +361,13 @@
 /* Index of SDS region used in the communication with SCP */
 #define SDS_SCP_AP_REGION_ID		U(0)
 
+/*******************************************************************************
+ * SMMUv3 Config
+ ******************************************************************************/
+
+/* SMMUv3 root offset register */
+#define PLAT_ARM_SMMUV3_ROOT_REG_OFFSET	UL(0xA0000)
+
 /*******************************************************************************
  * Platform type identification macro
  ******************************************************************************/