ar7: remove leftover 3.10 patches

target/linux/ar7/patches-3.10/001-mips-ar7-fix-serial.patch

target/linux/ar7/patches-3.10/110-flash.patch

target/linux/ar7/patches-3.10/120-gpio_chrdev.patch

...t/linux/ar7/patches-3.10/160-vlynq_try_remote_first.patch

...x/ar7/patches-3.10/200-free-mem-below-kernel-offset.patch

target/linux/ar7/patches-3.10/300-add-ac49x-platform.patch

target/linux/ar7/patches-3.10/310-ac49x-prom-support.patch

target/linux/ar7/patches-3.10/320-ac49x-mtd-partitions.patch

target/linux/ar7/patches-3.10/500-serial_kludge.patch

target/linux/ar7/patches-3.10/920-ar7part.patch

target/linux/ar7/patches-3.10/925-actiontec_leds.patch

target/linux/ar7/patches-3.10/950-cpmac_titan.patch