xdriver_xf86-video-imx: new package

X.Org driver for iMX5 GPU. Most of patches come from Yocto project.

Tested using:
    mx5loco_defconfig +
    BR2_TOOLCHAIN_EXTERNAL=y
    BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
    BR2_PACKAGE_QT5=y
    BR2_PACKAGE_QT5BASE_LICENSE_APPROVED=y
    BR2_PACKAGE_QT5BASE_EXAMPLES=y
    BR2_PACKAGE_QT5BASE_OPENGL_LIB=y
    BR2_PACKAGE_QT5BASE_XCB=y
    BR2_PACKAGE_QT5BASE_DEFAULT_QPA="xcb"
    BR2_PACKAGE_QT5BASE_GIF=y
    BR2_PACKAGE_QT5BASE_JPEG=y
    BR2_PACKAGE_QT5BASE_PNG=y
    BR2_PACKAGE_QT5QUICKCONTROLS=y
    BR2_PACKAGE_XORG7=y
    BR2_PACKAGE_XSERVER_XORG_SERVER=y
    BR2_PACKAGE_XSERVER_XORG_SERVER_MODULAR=y
    BR2_PACKAGE_XDRIVER_XF86_INPUT_EVDEV=y
    BR2_PACKAGE_XDRIVER_XF86_VIDEO_IMX=y
    BR2_PACKAGE_FREESCALE_IMX=y
    BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX53=y
    BR2_PACKAGE_GPU_AMD_BIN_MX51=y
    BR2_PACKAGE_GPU_AMD_BIN_MX51_EXAMPLES=y

[Thomas: minor tweaks to Config.in.]

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>