arm: rk30: add reboot into fastboot mode
Remove calling rk_fb_unregister in rk30_lcdc_shutdown

Call rk_fb_unregister in rk30_lcdc_remove instead, otherwise
kernel will panic when rebooting with a NULL pointer dereference.
rk30_hotdog_ti_kikat_defconfig: usb otg default to device mode
Correct rk30_cursor_set_pos
Change default wifi chip type from AP6330 to AP6181