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/m53menlo_defconfig b/configs/m53menlo_defconfig
index b4ada56..a576024 100644
--- a/configs/m53menlo_defconfig
+++ b/configs/m53menlo_defconfig
@@ -80,6 +80,7 @@
 CONFIG_SYS_BOOTCOUNT_MAGIC=0x0B01C041
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_MXC=y
+CONFIG_FSL_IIM=y
 CONFIG_FSL_ESDHC_IMX=y
 CONFIG_MTD=y
 CONFIG_MTD_RAW_NAND=y