clk: rockchip: rk3568: Add PLL rate for 115.2MHz

clk: rockchip: rk3568: Add PLL rate for 115.2MHz

Add support for a PLL rate of 115.2MHz so that the Powkiddy RK2023 panel
can run at a requested 60hz (59.99, close enough).

I have confirmed this rate fits with all the constraints
listed in the TRM for the VPLL (as an integer PLL) in Part 1 "Chapter
2 Clock & Reset Unit (CRU)."

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20231018161848.346947-4-macroalpha82@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>