pwm: samsung: Simplify by using devm functions in probe

With using devm_clk_get_enabled() and devm_pwmchip_add() the
.remove_new() callback can be dropped and an error path in .probe()
simplified.

Link: https://lore.kernel.org/r/d46ec625c14c460039082f74ec8ca3084b7c8e3a.1707900770.git.u.kleine-koenig@pengutronix.de


Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>