include: configs: Update env for selecting right dtb

Now that single defconfig can be used for booting J721E EVM and
SK, default device tree will not work for selecting dtb for
kernel. Update the findfdt env to select right dtb based on
board_name env variable.

Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>

include/configs/j721e_evm.h

@@ -66,6 +66,10 @@
 	"default_device_tree=" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0"	\
 	"findfdt="							\
 		"setenv name_fdt ${default_device_tree};"		\
+		"if test $board_name = j721e; then "			\
+			"setenv name_fdt k3-j721e-common-proc-board.dtb; fi;" \
+		"if test $board_name = j721e-eaik || test $board_name = j721e-sk; then "		\
+			"setenv name_fdt k3-j721e-sk.dtb; fi;"	\
 		"setenv fdtfile ${name_fdt}\0"				\
 	"name_kern=Image\0"						\
 	"console=ttyS2,115200n8\0"					\