i.MX7ULP: Fix wrong i2c configuration name

Wrong I2c driver configuration name is used in codes, so I2c driver is
not built. Correct it.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/configs/mx7ulp_evk_plugin_defconfig b/configs/mx7ulp_evk_plugin_defconfig
index b2451ad..970c0c7 100644
--- a/configs/mx7ulp_evk_plugin_defconfig
+++ b/configs/mx7ulp_evk_plugin_defconfig
@@ -20,6 +20,7 @@
 # CONFIG_MXC_GPIO is not set
 CONFIG_DM_I2C=y
 CONFIG_DM_MMC=y
+CONFIG_SYS_I2C_IMX_LPI2C=y
 CONFIG_SUPPORT_EMMC_BOOT=y
 CONFIG_FSL_USDHC=y
 CONFIG_PINCTRL=y