plat/arm: Fix load address of TB_FW_CONFIG

Load address of tb_fw_config is incorrectly mentioned
in below device trees:
1. rdn1edge_fw_config.dts
2. tc0_fw_config.dts

Till now, tb_fw_config load-address is not being retrieved from
device tree and hence never exeprienced any issue for tc0 and
rdn1edge platform.

For tc0 and rdn1edge platform, Load-address of tb_fw_config should
be the SRAM base address + 0x300 (size of fw_config device tree)
Hence updated these platform's fw_config.dts accordingly to reflect
this load address change.

Change-Id: I2ef8b05d49be10767db31384329f516df11ca817
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>

plat/arm/board/rdn1edge/fdts/rdn1edge_fw_config.dts

@@ -13,7 +13,7 @@
 
 		/* tb_fw_config is temporarily contained on this dtb */
 		tb_fw-config {
-			load-address = <0x0 0x80001010>;
+			load-address = <0x0 0x4001010>;
 			max-size = <0x200>;
 			id = <TB_FW_CONFIG_ID>;
 		};

plat/arm/board/tc0/fdts/tc0_fw_config.dts

@@ -14,7 +14,7 @@
 
 		/* tb_fw_config is temporarily contained in this dtb */
 		tb_fw-config {
-			load-address = <0x0 0x2001010>;
+			load-address = <0x0 0x4001010>;
 			max-size = <0x200>;
 			id = <TB_FW_CONFIG_ID>;
 		};