plat/arm/sgi: add chip_id and multi_chip_mode to platform variant info

Multi-chip platforms have two or more identical chips connected using a
high speed coherent link. In order to identify such platforms,
add chip_id and multi_chip_mode information in the platform variant
info structure. The values of these two new elements is populated
during boot.

Change-Id: Ie6e89cb33b3f0f408814f6239cd06647053e23ed
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
diff --git a/plat/arm/css/sgi/sgi_bl31_setup.c b/plat/arm/css/sgi/sgi_bl31_setup.c
index a2caf7c..2ff66ac 100644
--- a/plat/arm/css/sgi/sgi_bl31_setup.c
+++ b/plat/arm/css/sgi/sgi_bl31_setup.c
@@ -51,6 +51,7 @@
 {
 	sgi_plat_info.platform_id = plat_arm_sgi_get_platform_id();
 	sgi_plat_info.config_id = plat_arm_sgi_get_config_id();
+	sgi_plat_info.multi_chip_mode = plat_arm_sgi_get_multi_chip_mode();
 
 	arm_bl31_early_platform_setup((void *)arg0, arg1, arg2, (void *)arg3);
 }