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/emc2305.c b/board/freescale/common/emc2305.c
index 12ad4b3..9a75c5a 100644
--- a/board/freescale/common/emc2305.c
+++ b/board/freescale/common/emc2305.c
@@ -24,7 +24,7 @@
 			       I2C_EMC2305_FAN5};
 
 	for (index = 0; index < NUM_OF_FANS; index++) {
-#ifndef CONFIG_DM_I2C
+#if !CONFIG_IS_ENABLED(DM_I2C)
 		if (i2c_write(chip_addr, Fan[index], 1, &data, 1) != 0) {
 			printf("Error: failed to change fan speed @%x\n",
 			       Fan[index]);
@@ -48,7 +48,7 @@
 	u8 data;
 
 	data = I2C_EMC2305_CMD;
-#ifndef CONFIG_DM_I2C
+#if !CONFIG_IS_ENABLED(DM_I2C)
 	if (i2c_write(chip_addr, I2C_EMC2305_CONF, 1, &data, 1) != 0)
 		printf("Error: failed to configure EMC2305\n");
 #else