include: configs: j721e_evm: Change to using .env

Move to using .env file for setting up environment variables for J721E
and J7200.

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/ti/j721e/Kconfig b/board/ti/j721e/Kconfig
index ca82739..84bca32 100644
--- a/board/ti/j721e/Kconfig
+++ b/board/ti/j721e/Kconfig
@@ -56,6 +56,9 @@
 config SYS_CONFIG_NAME
        default "j721e_evm"
 
+config ENV_SOURCE_FILE
+       default "j721e"
+
 source "board/ti/common/Kconfig"
 
 endif
@@ -71,6 +74,9 @@
 config SYS_CONFIG_NAME
        default "j721e_evm"
 
+config ENV_SOURCE_FILE
+       default "j721e"
+
 source "board/ti/common/Kconfig"
 
 endif
@@ -86,6 +92,9 @@
 config SYS_CONFIG_NAME
        default "j721e_evm"
 
+config ENV_SOURCE_FILE
+       default "j721e"
+
 source "board/ti/common/Kconfig"
 
 endif
@@ -101,6 +110,9 @@
 config SYS_CONFIG_NAME
        default "j721e_evm"
 
+config ENV_SOURCE_FILE
+       default "j721e"
+
 source "board/ti/common/Kconfig"
 
 endif