fixed: invalid IPU setting for imx6dl CPU

An invalid IPU assignment for IMX6DL would cause a kernel crash

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
ventana: add Gateworks Ventana specific kernel cfg

We need to vary some options defined in imx6_android_defconfig:
 - MX6_CLK_FOR_BOOTUI_TRANS=y causes HDMI output to fail on IMX6DL
 - CONFIG_PCIPORTBUS=y causes PCIe device issues
 - VMSPLIT_3G=y allows userspace to utilize 1GB of memory

Signed-off-by: Tim Harvey <tharvey@gateworks.com>