ASoC: codecs: wcd937x: Remove unused of_gpio.h

of_gpio.h is deprecated and subject to remove. The drivers in question
don't use it, simply remove the unused header.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20241031103302.2450830-1-andriy.shevchenko@linux.intel.com


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