imx6: add initial 3.13 support

target/linux/imx6/config-3.13

...atches-3.13/0001-ARM-dts-disable-flexcan-by-default.patch

...13/0002-ARM-dts-added-several-new-imx-pinmux-groups.patch

...hes-3.13/0003-ARM-dts-add-Gateworks-Ventana-support.patch

...04-imx-add-PCI-fixup-for-PEX860X-on-Gateworks-board.patch

...CI-designware-Fix-I-O-transfers-by-using-CPU-not-re.patch

...t/linux/imx6/patches-3.13/0040-i2c-imx-retry-on-NAK.patch

...x6/patches-3.13/0050-sky2-allow-mac-to-come-from-dt.patch

target/linux/imx6/patches-3.13/100-bootargs.patch

...tches-3.13/200-PCI-imx6-add-support-for-legacy-irqs.patch