Add support for a PLL rate of 292.5MHz so that the Powkiddy RGB30 panel
can run at a requested 60hz (59.96, 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/20231018153357.343142-2-macroalpha82@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>