board: stm32mp1: use IS_ENABLED to prevent ifdef in dk2_i2c1_fix

Use IS_ENABLED to prevent ifdef in dk2_i2c1_fix.
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: NPatrice Chotard <patrice.chotard@st.com>

board/st/stm32mp1/stm32mp1.c

@@ -521,7 +521,6 @@ static void sysconf_init(void)
 	clrbits_le32(syscfg + SYSCFG_CMPCR, SYSCFG_CMPCR_SW_CTRL);
 }
 
-#ifdef CONFIG_DM_REGULATOR
 /* Fix to make I2C1 usable on DK2 for touchscreen usage in kernel */
 static int dk2_i2c1_fix(void)
 {
@@ -529,6 +528,9 @@ static int dk2_i2c1_fix(void)
 	struct gpio_desc hdmi, audio;
 	int ret = 0;
 
+	if (!IS_ENABLED(CONFIG_DM_REGULATOR))
+		return -ENODEV;
+
 	node = ofnode_path("/soc/i2c@40012000/hdmi-transmitter@39");
 	if (!ofnode_valid(node)) {
 		pr_debug("%s: no hdmi-transmitter@39 ?\n", __func__);
@@ -586,7 +588,6 @@ static bool board_is_dk2(void)
 
 	return false;
 }
-#endif
 
 static bool board_is_ev1(void)
 {
@@ -634,12 +635,11 @@ int board_init(void)
 	if (board_is_ev1())
 		board_ev1_init();
 
-#ifdef CONFIG_DM_REGULATOR
 	if (board_is_dk2())
 		dk2_i2c1_fix();
 
-	regulators_enable_boot_on(_DEBUG);
-#endif
+	if (IS_ENABLED(CONFIG_DM_REGULATOR))
+		regulators_enable_boot_on(_DEBUG);
 
 	if (!IS_ENABLED(CONFIG_TFABOOT))
 		sysconf_init();