configs: am65x_evm_a53: Add initial support

Add initial defconfig support for AM65x that runs on A53.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/board/ti/am65x/MAINTAINERS b/board/ti/am65x/MAINTAINERS
index c5921b4..ca1ce58 100644
--- a/board/ti/am65x/MAINTAINERS
+++ b/board/ti/am65x/MAINTAINERS
@@ -3,3 +3,4 @@
 S:	Maintained
 F:	board/ti/am65x/
 F:	include/configs/am65x_evm.h
+F:	configs/am65x_evm_a53_defconfig