pwm: imx27: Use clk_bulk_*() API to simplify clock handling

Simplify the clock handling logic by using the clk_bulk_*() API.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240910-pwm-v3-2-fbb047896618@nxp.com


Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>