dt-bindings: clock: rk3128: Add PCLK_MIPIPHY

The DPHY's APB clock is required to be exposed in order to be able to
enable it and access the phy's registers.

Signed-off-by: Alex Bee <knaerzche@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240509140653.168591-3-knaerzche@gmail.com


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