dm: i2c: use CONFIG_IS_ENABLED macro for DM_I2C/DM_I2C_GPIO

Use CONFIG_IS_ENABLED() macro, which provides more convenient
way to check $(SPL)DM_I2C/$(SPL)DM_I2C_GPIO configs
for both SPL and U-Boot proper.

CONFIG_IS_ENABLED(DM_I2C) expands to:
- 1 if CONFIG_SPL_BUILD is undefined and CONFIG_DM_I2C is set to 'y',
- 1 if CONFIG_SPL_BUILD is defined and CONFIG_SPL_DM_I2C is set to 'y',
- 0 otherwise.

All occurences were replaced automatically using these bash cmds:
$ find . -type f -exec sed -i
     's/ifndef CONFIG_DM_I2C/if !CONFIG_IS_ENABLED(DM_I2C)/g' {} +
$ find . -type f -exec sed -i
    's/ifdef CONFIG_DM_I2C/if CONFIG_IS_ENABLED(DM_I2C)/g' {} +
$ find . -type f -exec sed -i
    's/defined(CONFIG_DM_I2C)/CONFIG_IS_ENABLED(DM_I2C)/g' {} +
$ find . -type f -exec sed -i
    's/ifndef CONFIG_DM_I2C_GPIO/if !CONFIG_IS_ENABLED(DM_I2C_GPIO)/g' {} +
$ find . -type f -exec sed -i
    's/ifdef CONFIG_DM_I2C_GPIO/if CONFIG_IS_ENABLED(DM_I2C_GPIO)/g' {} +
$ find . -type f -exec sed -i
    's/defined(CONFIG_DM_I2C_GPIO)/CONFIG_IS_ENABLED(DM_I2C_GPIO)/g' {} +

Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@foundries.io>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/board/freescale/common/vsc3316_3308.c b/board/freescale/common/vsc3316_3308.c
index 8aceb8e..c51f3c5 100644
--- a/board/freescale/common/vsc3316_3308.c
+++ b/board/freescale/common/vsc3316_3308.c
@@ -34,7 +34,7 @@
 
 	/* enable 2-wire Serial InterFace (I2C) */
 	data = 0x02;
-#ifdef CONFIG_DM_I2C
+#if CONFIG_IS_ENABLED(DM_I2C)
 	int ret, bus_num = 0;
 	struct udevice *dev;
 
@@ -62,7 +62,7 @@
 	debug("VSC:Initializing VSC3316 at I2C address 0x%2x"
 		" for Tx\n", vsc_addr);
 
-#ifdef CONFIG_DM_I2C
+#if CONFIG_IS_ENABLED(DM_I2C)
 	int bus_num = 0;
 	struct udevice *dev;
 
@@ -185,7 +185,7 @@
 	debug("VSC:Initializing VSC3308 at I2C address 0x%x for Tx\n",
 	      vsc_addr);
 
-#ifdef CONFIG_DM_I2C
+#if CONFIG_IS_ENABLED(DM_I2C)
 	int bus_num = 0;
 	struct udevice *dev;
 
@@ -385,7 +385,7 @@
 
 	debug("VSC:Initializing VSC3308 at I2C address 0x%x"
 		" for Tx\n", vsc_addr);
-#ifdef CONFIG_DM_I2C
+#if CONFIG_IS_ENABLED(DM_I2C)
 	int bus_num = 0;
 	struct udevice *dev;
 
@@ -509,7 +509,7 @@
 
 	/* For new crosspoint configuration to occur, WP bit of
 	 * CORE_CONFIG_REG should be set 1 and then reset to 0 */
-#ifdef CONFIG_DM_I2C
+#if CONFIG_IS_ENABLED(DM_I2C)
 	int ret, bus_num = 0;
 	struct udevice *dev;