mtd: rawnand: renesas: Use runtime PM instead of the raw clock API

This NAND controller is part of a well defined power domain handled by
the runtime PM core. Let's keep the harmony with the other RZ/N1 drivers
and exclusively use the runtime PM API to enable/disable the clocks.

We still need to retrieve the external clock rate in order to derive the
NAND timings, but that is not a big deal, we can still do that in the
probe and just save this value to reuse it later.

Signed-off-by: Miquel Raynal <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

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