clk: renesas: rcar-gen3: Avoid double table iteration in SD .set_rate()

The .set_rate() callback for the SD clocks is always called with a valid
clock rate, returned by .round_rate().  Hence there is no need to
iterate through the divider table twice: once to repeat the work done by
.round_rate(), and a second time to find the corresponding divider
entry.

Just iterate once, looking for the divider that matches the passed clock
rate.

Signed-off-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Niklas Söderlund <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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