clk: rockchip: add ids for camera on rk3399

we use SCLK_TESTCLKOUT1 and SCLK_TESTCLKOUT2 for camera, so add those ids.

Signed-off-by: Eddie Cai <eddie.cai.linux@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>