board: ti: j784s4: Add boot environment variables

Add env file with necessary boot variables.

[ added env files ]
Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
[ cleaned up the env files ]
Signed-off-by: Manorit Chawdhry <m-chawdhry@ti.com>
Signed-off-by: Apurva Nandan <a-nandan@ti.com>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> # AM69-SK

board/ti/j784s4/j784s4.env

@@ -0,0 +1,17 @@
+#include <env/ti/ti_common.env>
+#include <env/ti/mmc.env>
+#include <env/ti/ufs.env>
+#include <env/ti/k3_dfu.env>
+
+name_kern=Image
+console=ttyS2,115200n8
+args_all=setenv optargs ${optargs} earlycon=ns16550a,mmio32,0x02880000
+	${mtdparts}
+run_kern=booti ${loadaddr} ${rd_spec} ${fdtaddr}
+
+boot_targets=mmc1 mmc0 usb pxe dhcp
+boot=mmc
+mmcdev=1
+bootpart=1:2
+bootdir=/boot
+rd_spec=-