configs: j784s4_evm: Add defconfig for J784S4 EVM board

Add defconfigs for building R5 U-Boot SPL and A72 U-Boot.

Signed-off-by: Hari Nagalla <hnagalla@ti.com>
Signed-off-by: Apurva Nandan <a-nandan@ti.com>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> # AM69-SK
diff --git a/board/ti/j784s4/MAINTAINERS b/board/ti/j784s4/MAINTAINERS
index 8b03a7a..2b6bff2 100644
--- a/board/ti/j784s4/MAINTAINERS
+++ b/board/ti/j784s4/MAINTAINERS
@@ -4,6 +4,8 @@
 F:	board/ti/j784s4
 F:	arch/arm/mach-k3/j784s4
 F:	include/configs/j784s4_evm.h
+F:	configs/j784s4_evm_r5_defconfig
+F:	configs/j784s4_evm_a72_defconfig
 F:	arch/arm/dts/k3-j784s4-evm-u-boot.dtsi
 F:	arch/arm/dts/k3-j784s4-r5-evm.dts
 F:	arch/arm/dts/k3-j784s4-ddr.dtsi