configs: warpboard: Use the final U-boot release version

We should better use the final U-boot version rather than the release
candidate one.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/warpboard_defconfig

@@ -31,7 +31,7 @@ BR2_PACKAGE_LINUX_FIRMWARE_BRCM_BCM43XX=y
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BOARDNAME="warp"
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2015.07-rc2"
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2015.07"
 BR2_TARGET_UBOOT_FORMAT_IMX=y
 
 # host utility