plat/arm/sgi: Use NT_FW_CONFIG instead of HW_CONFIG

With the two new APIs 'plat_arm_sgi_get_platform_id' and
'plat_arm_sgi_get_config_id' that are available now, BL31 need not
depend on hw_config device tree to identify the platform. In addition
to this, the existing hardware description in hw_config can be limited
to use by BL33 and not by the operating system.

So the hardware description from hw_config dts can be moved into
nt_fw_config dts and the use of hw_config dts can be removed.

Change-Id: I873b7e1e72823d3ec5d253a848e85ae724f09e49
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>
diff --git a/plat/arm/css/sgi/sgi_image_load.c b/plat/arm/css/sgi/sgi_image_load.c
index 39069ca..e078bd2 100644
--- a/plat/arm/css/sgi/sgi_image_load.c
+++ b/plat/arm/css/sgi/sgi_image_load.c
@@ -25,9 +25,9 @@
 	int nodeoffset, err;
 	unsigned int platid = 0, platcfg = 0;
 
-	mem_params = get_bl_mem_params_node(HW_CONFIG_ID);
+	mem_params = get_bl_mem_params_node(NT_FW_CONFIG_ID);
 	if (mem_params == NULL) {
-		ERROR("HW CONFIG base address is NULL");
+		ERROR("NT_FW CONFIG base address is NULL");
 		return -1;
 	}
 
@@ -35,7 +35,7 @@
 
 	/* Check the validity of the fdt */
 	if (fdt_check_header(fdt) != 0) {
-		ERROR("Invalid HW_CONFIG DTB passed\n");
+		ERROR("Invalid NT_FW_CONFIG DTB passed\n");
 		return -1;
 	}