regulator: rc5t583: Drop useless header

The RC5T583 includes the legacy header <linux/gpio.h> for no
reason, drop the include.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230808-descriptors-regulator-v1-5-939b5e84dd18@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Linus Walleij

drivers/regulator/rc5t583-regulator.c

@@ -16,7 +16,6 @@
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
-#include <linux/gpio.h>
 #include <linux/mfd/rc5t583.h>
 
 struct rc5t583_regulator_info {