spi: spi-offload-trigger-pwm: add extra headers

Add additional headers used in this driver. This is better than relying
on implicit includes via other unrelated headers.

Also sort the existing includes while doing so.

Suggested-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20250210-spi-offload-extra-headers-v1-2-0f3356362254@baylibre.com


Signed-off-by: Mark Brown <broonie@kernel.org>