wandboard: Use kernel version 4.7.3

Wandboard is well supported in the mainline kernel, so let's switch
from the 3.14 vendor kernel to 4.7.3 mainline kernel version.

As mainline use more dts files to support both B1 and C1 versions of the
board, adjust the dts entries accordingly.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

configs/wandboard_defconfig

@@ -1,7 +1,7 @@
 BR2_arm=y
 BR2_cortex_a9=y
-# Linux headers same as kernel, a 3.14 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_14=y
+# Linux headers same as kernel, a 4.7 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_7=y
 BR2_TARGET_GENERIC_GETTY_PORT="ttymxc0"
 BR2_PACKAGE_HOST_GENIMAGE=y
 BR2_ROOTFS_POST_IMAGE_SCRIPT="board/wandboard/post-image.sh"
@@ -21,9 +21,9 @@ BR2_TARGET_UBOOT_ENVIMAGE_SOURCE="board/wandboard/uboot-env.txt"
 BR2_TARGET_UBOOT_ENVIMAGE_SIZE="0x2000"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
-BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/wandboard-org/linux"
-BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="e2213f9a98dd7413ee5a9ca40cf60e8cb8292f4a"
-BR2_LINUX_KERNEL_DEFCONFIG="wandboard"
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.7.3"
+BR2_LINUX_KERNEL_DEFCONFIG="imx_v6_v7"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
-BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6q-wandboard imx6dl-wandboard"
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx6q-wandboard imx6dl-wandboard imx6q-wandboard-revb1 imx6dl-wandboard-revb1"
 BR2_LINUX_KERNEL_INSTALL_TARGET=y