clk: rockchip: Add more PLL rates for rk3568

This adds a few more PLL settings needed for some standard resolutions:

297MHz    3840x2160-30.00
241.5MHz  2560x1440-59.95
135MHz    1280x1024-75.02
119MHz    1680x1050-59.88
108MHz    1280x1024-60.02
 78.75MHz 1024x768-75.03

Changes since v3:
- new patch

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20220126145549.617165-12-s.hauer@pengutronix.de
Signed-off-by: Heiko Stuebner <heiko@sntech.de>