board: ti: am65x: Enable fixing up msmc sram node

Create a ft_board_setup() api that gets called as part of
DT fixup before jumping to kernel. In this ft_board_setup()
call fdt_fixup_msmc_ram that update msmc sram node.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/board/ti/am65x/evm.c b/board/ti/am65x/evm.c
index 784b2b0..52f5d6b 100644
--- a/board/ti/am65x/evm.c
+++ b/board/ti/am65x/evm.c
@@ -10,6 +10,7 @@
 #include <common.h>
 #include <asm/io.h>
 #include <spl.h>
+#include <asm/arch/sys_proto.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -66,3 +67,16 @@
 	return -1;
 }
 #endif
+
+#if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_OF_BOARD_SETUP)
+int ft_board_setup(void *blob, bd_t *bd)
+{
+	int ret;
+
+	ret = fdt_fixup_msmc_ram(blob, "/interconnect@100000", "sram@70000000");
+	if (ret)
+		printf("%s: fixing up msmc ram failed %d\n", __func__, ret);
+
+	return ret;
+}
+#endif