arm64: dts: rockchip: set max drive-strength for cif_clkout_m0 on px30-evb

Add max drive-strength for cif_clkout_m0. This fix the issue that
sometimes camera ov5695 is not probed correctly.
Tested on PX30_Mini_EVB_V11_20190507

Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
Link: https://lore.kernel.org/r/20220620161321.1898840-2-tommaso.merciai@amarulasolutions.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>