MAINTAINERS: Add maintainer for HiSilicon GPIO driver

Here add maintainer information for HiSilicon GPIO driver.
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Link: https://lore.kernel.org/r/1607934255-52544-3-git-send-email-luojiaxing@huawei.com
[Dropped some dead code when applying]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -7908,6 +7908,13 @@ L:	dmaengine@vger.kernel.org
 S:	Maintained
 F:	drivers/dma/hisi_dma.c
 
+HISILICON GPIO DRIVER
+M:	Luo Jiaxing <luojiaxing@huawei.com>
+L:	linux-gpio@vger.kernel.org
+S:	Maintained
+F:	drivers/gpio/gpio-hisi.c
+F:	include/linux/platform_data/gpio-hisi.h
+
 HISILICON HIGH PERFORMANCE RSA ENGINE DRIVER (HPRE)
 M:	Zaibo Xu <xuzaibo@huawei.com>
 L:	linux-crypto@vger.kernel.org

drivers/gpio/gpio-hisi.c

@@ -254,7 +254,6 @@ static void hisi_gpio_get_pdata(struct device *dev,
 static int hisi_gpio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	void __iomem *dat, *set, *clr;
 	struct hisi_gpio *hisi_gpio;
 	int port_num;
 	int ret;
@@ -279,10 +278,6 @@ static int hisi_gpio_probe(struct platform_device *pdev)
 
 	hisi_gpio->dev = dev;
 
-	dat = hisi_gpio->reg_base + HISI_GPIO_EXT_PORT_WX;
-	set = hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_SET_WX;
-	clr = hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_CLR_WX;
-
 	ret = bgpio_init(&hisi_gpio->chip, hisi_gpio->dev, 0x4,
 			 hisi_gpio->reg_base + HISI_GPIO_EXT_PORT_WX,
 			 hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_SET_WX,