regulator: bd71815: Drop useless header

The bd71815 regulator driver includes the legacy header
<linux/gpio.h> for no reason, it is already using the proper
<linux/gpio/consumer.h> include. Drop the include.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230808-descriptors-regulator-v1-11-939b5e84dd18@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/bd71815-regulator.c

@@ -18,7 +18,6 @@
 #include <linux/regulator/driver.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
-#include <linux/gpio.h>
 #include <linux/mfd/rohm-generic.h>
 #include <linux/mfd/rohm-bd71815.h>
 #include <linux/regulator/of_regulator.h>