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/usbarmory_defconfig b/configs/usbarmory_defconfig
index 510e215..ed2bcc6 100644
--- a/configs/usbarmory_defconfig
+++ b/configs/usbarmory_defconfig
@@ -29,6 +29,7 @@
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SYS_I2C_LEGACY=y
 CONFIG_SYS_I2C_MXC=y
+CONFIG_FSL_IIM=y
 CONFIG_FSL_ESDHC_IMX=y
 CONFIG_MTD=y
 CONFIG_PINCTRL=y