mmc: sunxi: Correcting SDXC_HARDWARE_RESET bit

Fixing the register name in sunxi_mmc_reset_host since the
SDXC_HARDWARE_RESET bit is actually located within REG_GCTRL and not
REG_CMDR as it was pointed out by Allwinner.
Signed-off-by: David Lanzendörfer <david.lanzendoerfer@o2s.ch>
Reported-by: <lixiang@allwinnertech.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sunxi-mmc.c

@@ -252,7 +252,7 @@ static int sunxi_mmc_reset_host(struct sunxi_mmc_host *host)
 	unsigned long expire = jiffies + msecs_to_jiffies(250);
 	u32 rval;
 
-	mmc_writel(host, REG_CMDR, SDXC_HARDWARE_RESET);
+	mmc_writel(host, REG_GCTRL, SDXC_HARDWARE_RESET);
 	do {
 		rval = mmc_readl(host, REG_GCTRL);
 	} while (time_before(jiffies, expire) && (rval & SDXC_HARDWARE_RESET));