feat(rdn2): add board support for rdn2cfg2 variant

Add board support for variant 2 of RD-N2 platform which is a four chip
variant with 4 cores on each chip. The "CSS_SGI_PLATFORM_VARIANT" value
is 2 for multi-chip variant. The "CSS_SGI_CHIP_COUNT_MACRO" can be in
the range [1, 4] for multi-chip variant.

Signed-off-by: Aditya Angadi <aditya.angadi@arm.com>
Change-Id: I6412106e80e2f17704c796226c2ee9fe808705ba
diff --git a/plat/arm/css/sgi/sgi_plat_v2.c b/plat/arm/css/sgi/sgi_plat_v2.c
index 131cdf2..1a2a966 100644
--- a/plat/arm/css/sgi/sgi_plat_v2.c
+++ b/plat/arm/css/sgi/sgi_plat_v2.c
@@ -42,6 +42,15 @@
 	SOC_PLATFORM_PERIPH_MAP_DEVICE,
 	SOC_SYSTEM_PERIPH_MAP_DEVICE,
 	ARM_MAP_NS_DRAM1,
+#if CSS_SGI_CHIP_COUNT > 1
+	SOC_MEMCNTRL_MAP_DEVICE_REMOTE_CHIP(1),
+#endif
+#if CSS_SGI_CHIP_COUNT > 2
+	SOC_MEMCNTRL_MAP_DEVICE_REMOTE_CHIP(2),
+#endif
+#if CSS_SGI_CHIP_COUNT > 3
+	SOC_MEMCNTRL_MAP_DEVICE_REMOTE_CHIP(3),
+#endif
 #if ARM_BL31_IN_DRAM
 	ARM_MAP_BL31_SEC_DRAM,
 #endif