i2c: imx_lpi2c: Fix misuse the IS_ENABLED for DM clock

The IS_ENABLED, which does not consider SPL build, should be replaced
by CONFIG_IS_ENABLED.
For the case that we only enable DM CLK for u-boot but not in SPL, the
IS_ENABLED(CONFIG_CLK) still returns true, then cause clock failure.

Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/i2c/imx_lpi2c.c b/drivers/i2c/imx_lpi2c.c
index 92c5003..ad9293c 100644
--- a/drivers/i2c/imx_lpi2c.c
+++ b/drivers/i2c/imx_lpi2c.c
@@ -282,7 +282,7 @@
 	bool mode;
 	int i;
 
-	if (IS_ENABLED(CONFIG_CLK)) {
+	if (CONFIG_IS_ENABLED(CLK)) {
 		clock_rate = clk_get_rate(&i2c_bus->per_clk);
 		if (clock_rate <= 0) {
 			dev_err(bus, "Failed to get i2c clk: %d\n", clock_rate);
@@ -462,7 +462,7 @@
 		return ret;
 	}
 
-	if (IS_ENABLED(CONFIG_CLK)) {
+	if (CONFIG_IS_ENABLED(CLK)) {
 		ret = clk_get_by_name(bus, "per", &i2c_bus->per_clk);
 		if (ret) {
 			dev_err(bus, "Failed to get per clk\n");