staging: most: dim2: use dev_err_probe() for clock errors in rcar enable functions

rcar_gen2_enable() and rcar_gen3_enable() use the old pattern of
dev_err() followed by return PTR_ERR() when devm_clk_get() fails.
fsl_mx6_enable() in the same file was already converted to use
dev_err_probe() by a previous cleanup series.

Convert the remaining two functions for consistency. devm_clk_get()
calls clk_get() which can return -EPROBE_DEFER if the clock provider
has not yet registered. Using dev_err_probe() suppresses the log at
error level in that case, avoiding misleading "cannot get clock" output
during a normal deferred probe.

clk_prepare_enable() cannot return -EPROBE_DEFER since the clock handle
is already acquired at that point, so those error paths are left as
dev_err().

Assisted-by: Claude:claude-sonnet-4-6
Signed-off-by: Batu Ada Tutkun <batuadatutkun@gmail.com>
Reviewed-by: Dan Carpenter <error27@gmail.com>
Link: https://patch.msgid.link/6a4ff7ac.cef1946f.13cfe2.dd63@mx.google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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