wifi: brcmsmac: Drop legacy header

The driver is using all the modern abstractions to obtain and use
GPIOs and the legacy <linux/gpio.h> header is unused, so drop it.

Fixes: a8e59744 ("gpiolib: split linux/gpio/driver.h out of linux/gpio.h")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240131-descriptors-wireless-v1-3-e1c7c5d68746@linaro.org

drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c

 // SPDX-License-Identifier: GPL-2.0
 #include <net/mac80211.h>
 #include <linux/bcma/bcma_driver_chipcommon.h>
-#include <linux/gpio.h>
 #include <linux/gpio/driver.h>
 #include <linux/gpio/machine.h>
 #include <linux/gpio/consumer.h>