brcm2708: remove linux 3.10 support

target/linux/brcm2708/config-3.10

.../brcm2708/patches-3.10/0001-Main-bcm2708-linux-port.patch

...linux/brcm2708/patches-3.10/0002-Add-dwc_otg-driver.patch

.../brcm2708/patches-3.10/0003-bcm2708-watchdog-driver.patch

...cm2708/patches-3.10/0004-bcm2708-framebuffer-driver.patch

...nux/brcm2708/patches-3.10/0005-bcm2708-vchiq-driver.patch

....10/0006-cma-Add-vc_cma-driver-to-enable-use-of-CMA.patch

...rcm2708/patches-3.10/0007-bcm2708-alsa-sound-driver.patch

...s-3.10/0008-Allow-mac-address-to-be-set-in-smsc95xx.patch

...possible-fix-for-sdcard-missing-status.-Thank-naren.patch

...ches-3.10/0010-sdcard-patch-improvements-from-naren.patch

...8/patches-3.10/0011-sdhci-bcm2708-speed-up-DMA-sync.patch

....10/0012-sdhci-bcm2708-remove-custom-clock-handling.patch

...tches-3.10/0013-sdhci-bcm2708-add-additional-quirks.patch

...10/0014-sdhci-bcm2708-add-allow_highspeed-parameter.patch

...es-3.10/0015-sdhci-bcm2708-assume-50-MHz-eMMC-clock.patch

...llow-emmc-clock-to-be-specified-as-command-line-par.patch

...ches-3.10/0017-sdhci-bcm2708-raise-DMA-sync-timeout.patch

...-3.10/0018-Use-ndelay-rather-than-udelay.-Thanks-lb.patch

...0/0019-Backport-of-Chris-Boot-s-i2c-and-spi-drivers.patch