gpio: stm32f7: Remove CONFIG_CLK flag.

As all STM32 SoCs supports CONFIG_CLK flag,
it becomes useless in this driver, remove it.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/drivers/gpio/stm32f7_gpio.c b/drivers/gpio/stm32f7_gpio.c
index 34cdafa..f160b4e 100644
--- a/drivers/gpio/stm32f7_gpio.c
+++ b/drivers/gpio/stm32f7_gpio.c
@@ -151,6 +151,7 @@
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 	struct stm32_gpio_priv *priv = dev_get_priv(dev);
 	struct ofnode_phandle_args args;
+	struct clk clk;
 	fdt_addr_t addr;
 	const char *name;
 	int ret;
@@ -184,8 +185,6 @@
 		(u32 *)priv->regs, uc_priv->bank_name, uc_priv->gpio_count,
 		priv->gpio_range);
 
-#ifdef CONFIG_CLK
-	struct clk clk;
 	ret = clk_get_by_index(dev, 0, &clk);
 	if (ret < 0)
 		return ret;
@@ -197,7 +196,6 @@
 		return ret;
 	}
 	debug("clock enabled for device %s\n", dev->name);
-#endif
 
 	return 0;
 }