gemini: add 3.18 support

target/linux/gemini/config-3.18

target/linux/gemini/patches-3.18/002-gemini-rtc.patch

target/linux/gemini/patches-3.18/021-reset-parameters.patch

target/linux/gemini/patches-3.18/050-gpio-to-irq.patch

target/linux/gemini/patches-3.18/060-cache-fa.diff

...ini/patches-3.18/110-watchdog-add-gemini_wdt-driver.patch

...ini/patches-3.18/111-arm-gemini-add-watchdog-device.patch

...tches-3.18/112-arm-gemini-register-watchdog-devices.patch

.../gemini/patches-3.18/120-net-add-gemini-gmac-driver.patch

...emini/patches-3.18/121-arm-gemini-register-ethernet.patch

target/linux/gemini/patches-3.18/130-usb-ehci-fot2g.patch

...nux/gemini/patches-3.18/132-arm-gemini-register-usb.patch

.../gemini/patches-3.18/140-arm-gemini-add-pci-support.patch

target/linux/gemini/patches-3.18/150-gemini-pata.patch

target/linux/gemini/patches-3.18/160-gemini-timers.patch

target/linux/gemini/raidsonic/config-3.18