fsl-mc: msi: Added FSL-MC-specific member to the msi_desc's union

FSL-MC is a bus type different from PCI and platform, so it needs
its own member in the msi_desc's union.
Signed-off-by: J. German Rivera <German.Rivera@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/msi.h

@@ -32,6 +32,14 @@ struct platform_msi_desc {
 	u16				msi_index;
 };
 
+/**
+ * fsl_mc_msi_desc - FSL-MC device specific msi descriptor data
+ * @msi_index:		The index of the MSI descriptor
+ */
+struct fsl_mc_msi_desc {
+	u16				msi_index;
+};
+
 /**
  * struct msi_desc - Descriptor structure for MSI based interrupts
  * @list:	List head for management
@@ -87,6 +95,7 @@ struct msi_desc {
 		 * tree wide cleanup.
 		 */
 		struct platform_msi_desc platform;
+		struct fsl_mc_msi_desc fsl_mc;
 	};
 };