remove support for 2.6.37 and 2.6.38

target/linux/brcm63xx/config-2.6.37

target/linux/brcm63xx/config-2.6.38

target/linux/brcm63xx/patches-2.6.37/001-6345_cpu.patch

.../linux/brcm63xx/patches-2.6.37/007-usb-ohci-support.patch

.../linux/brcm63xx/patches-2.6.37/008-usb-ehci-support.patch

...63xx/patches-2.6.37/010-add_bcm63xx_ohci_controller.patch

...63xx/patches-2.6.37/011-add_bcm63xx_ehci_controller.patch

...linux/brcm63xx/patches-2.6.37/040-bcm963xx_flashmap.patch

...63xx/patches-2.6.37/041-bcm963xx_real_rootfs_length.patch

...patches-2.6.37/070_bcm63xx_enet_vlan_incoming_fixed.patch

target/linux/brcm63xx/patches-2.6.37/080-bcm6345_enet.patch

target/linux/brcm63xx/patches-2.6.37/100-reset_buttons.patch

target/linux/brcm63xx/patches-2.6.37/110-gpiodev.patch

target/linux/brcm63xx/patches-2.6.37/141-led_count.patch

...brcm63xx/patches-2.6.37/180-udc_preliminary_support.patch

...cm63xx/patches-2.6.37/200-extended-platform-devices.patch

...et/linux/brcm63xx/patches-2.6.37/200-spi-board-info.patch

...m63xx/patches-2.6.37/210-no_ehci_over_current_check.patch

target/linux/brcm63xx/patches-2.6.37/220-wl_exports.patch

...63xx/patches-2.6.37/230-6358-enet1-external-mii-clk.patch