the rk8xx chip id is:
((MSB << 8) | LSB) & 0xfff0
Signed-off-by: NElaine Zhang <zhangqing@rock-chips.com>
Signed-off-by: NJoseph Chen <chenjh@rock-chips.com>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NLee Jones <lee.jones@linaro.org>