Add fsl_iim driver

Add a fsl_iim driver common to i.MX and MPC.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
diff --git a/arch/powerpc/include/asm/immap_512x.h b/arch/powerpc/include/asm/immap_512x.h
index d96e536..8248219 100644
--- a/arch/powerpc/include/asm/immap_512x.h
+++ b/arch/powerpc/include/asm/immap_512x.h
@@ -1272,4 +1272,6 @@
 #define CONFIG_SYS_MPC512x_USB_ADDR \
 			(CONFIG_SYS_IMMR + CONFIG_SYS_MPC512x_USB_OFFSET)
 
+#define IIM_BASE_ADDR	(CONFIG_SYS_IMMR + offsetof(immap_t, iim))
+
 #endif /* __IMMAP_512x__ */