configs: nitrogen*: bump u-boot version to v2016.03

Using the latest commit of our 2016.03 U-Boot branch:
https://github.com/boundarydevices/u-boot-imx6/tree/boundary-v2016.03

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/nitrogen6sx_defconfig

@@ -22,8 +22,8 @@ BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BOARDNAME="nitrogen6sx"
 BR2_TARGET_UBOOT_FORMAT_IMX=y
 BR2_TARGET_UBOOT_CUSTOM_TARBALL=y
-# Last version of branch boundary-v2015.07
-BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="http://github.com/boundarydevices/u-boot-imx6/tarball/a4070a8/u-boot-a4070a8.tar.gz"
+# Last version of branch boundary-v2016.03
+BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="https://github.com/boundarydevices/u-boot-imx6/archive/ed95621f.tar.gz"
 
 # kernel
 BR2_LINUX_KERNEL=y

configs/nitrogen6x_defconfig

@@ -22,8 +22,8 @@ BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BOARDNAME="nitrogen6q"
 BR2_TARGET_UBOOT_FORMAT_IMX=y
 BR2_TARGET_UBOOT_CUSTOM_TARBALL=y
-# Last version of branch boundary-v2015.07
-BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="http://github.com/boundarydevices/u-boot-imx6/tarball/a4070a8/u-boot-a4070a8.tar.gz"
+# Last version of branch boundary-v2016.03
+BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="https://github.com/boundarydevices/u-boot-imx6/archive/ed95621f.tar.gz"
 
 # kernel
 BR2_LINUX_KERNEL=y

configs/nitrogen7_defconfig

@@ -23,7 +23,8 @@ BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BOARDNAME="nitrogen7"
 BR2_TARGET_UBOOT_FORMAT_IMX=y
 BR2_TARGET_UBOOT_CUSTOM_TARBALL=y
-BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="http://github.com/boundarydevices/u-boot-imx6/tarball/b2e1315/u-boot-b2e1315.tar.gz"
+# Last version of branch boundary-v2016.03
+BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="https://github.com/boundarydevices/u-boot-imx6/archive/ed95621f.tar.gz"
 
 # kernel
 BR2_LINUX_KERNEL=y