Convert CONFIG_FSL_IIM to Kconfig

This converts the following to Kconfig:
   CONFIG_FSL_IIM

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/mx53ppd_defconfig b/configs/mx53ppd_defconfig
index 328f546..ed4ebbb 100644
--- a/configs/mx53ppd_defconfig
+++ b/configs/mx53ppd_defconfig
@@ -52,6 +52,7 @@
 CONFIG_I2C_MUX=y
 CONFIG_I2C_MUX_PCA954x=y
 CONFIG_MISC=y
+CONFIG_FSL_IIM=y
 CONFIG_I2C_EEPROM=y
 CONFIG_FSL_ESDHC_IMX=y
 CONFIG_MTD=y