boot/uboot: fix order of Config.in properties

Fixes the following check-package warning:

boot/uboot/Config.in:185: attributes order: type, default, depends on, select, help (http://nightly.buildroot.org/#_config_files)

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

boot/uboot/Config.in

@@ -181,8 +181,8 @@ config BR2_TARGET_UBOOT_NEEDS_ATF_BL31
 
 choice
 	prompt "U-Boot ATF BL31 format"
-	depends on BR2_TARGET_UBOOT_NEEDS_ATF_BL31
 	default BR2_TARGET_UBOOT_NEEDS_ATF_BL31_BIN
+	depends on BR2_TARGET_UBOOT_NEEDS_ATF_BL31
 
 config BR2_TARGET_UBOOT_NEEDS_ATF_BL31_BIN
 	bool "bl31.bin"