clk: hi3660: add clocks for video encoder, decoder and ISP

This patch adds more clocks for hi3660, including:
 - video encoder and decoder
 - ISP (Image Signal Processing)

Signed-off-by: Chen Jun <chenjun14@huawei.com>
Signed-off-by: Zhong Kaihua <zhongkaihua@huawei.com>
Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Reviewed-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>