tty: serial: fsl_lpuart: use dev_err_probe for clocks

Clocks might not be available yet when probing lpuart. Silence -517 errors
by using dev_err_probe.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20240411130449.1096090-1-alexander.stein@ew.tq-group.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>