cns21xx: add initial support for the Cavium CNS21xx SoC

target/linux/cns21xx/Makefile

target/linux/cns21xx/base-files/etc/diag.sh

target/linux/cns21xx/base-files/etc/uci-defaults/ns-k330

target/linux/cns21xx/base-files/lib/cns21xx.sh

...1xx/base-files/lib/preinit/05_cns21xx_load_button_drivers

target/linux/cns21xx/base-files/lib/upgrade/platform.sh

target/linux/cns21xx/config-2.6.36

target/linux/cns21xx/config-2.6.37

target/linux/cns21xx/image/Makefile

...2.6.36/001-arm-use-cache-alignment-from-asm-cahce-h.patch

...linux/cns21xx/patches-2.6.36/002-arm-debugll-printk.patch

...ns21xx/patches-2.6.36/003-arm-introduce-fa-platform.patch

...et/linux/cns21xx/patches-2.6.36/004-arm-add-fa-time.patch

...x/cns21xx/patches-2.6.36/005-arm-add-fa-gpio-driver.patch

...s21xx/patches-2.6.36/006-arm-add-fa-watchdog-driver.patch

target/linux/cns21xx/patches-2.6.36/100-cns21xx-core.patch

...x/cns21xx/patches-2.6.36/101-cns21xx-serial-support.patch

.../cns21xx/patches-2.6.36/102-cns21xx-gpiolib-support.patch

...cns21xx/patches-2.6.36/103-cns21xx-usb-ohci-support.patch

...cns21xx/patches-2.6.36/104-cns21xx-usb-ehci-support.patch