staging: fsl-mc: Add missing header

Compiling the fsl-mc bus driver will yield a couple of static analysis
errors:
warning: symbol 'fsl_mc_msi_domain_alloc_irqs' was not declared
warning: symbol 'fsl_mc_msi_domain_free_irqs' was not declared.
warning: symbol 'its_fsl_mc_msi_init' was not declared.
warning: symbol 'its_fsl_mc_msi_cleanup' was not declared.

Since these are properly declared, but the header is not included, add
it in the source files. This way the symbol is properly exported.
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-mc/bus/fsl-mc-msi.c

@@ -17,6 +17,7 @@
 #include <linux/irqdomain.h>
 #include <linux/msi.h>
 #include "../include/mc-bus.h"
+#include "fsl-mc-private.h"
 
 /*
  * Generate a unique ID identifying the interrupt (only used within the MSI

drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c

@@ -17,6 +17,7 @@
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include "../include/mc-bus.h"
+#include "fsl-mc-private.h"
 
 static struct irq_chip its_msi_irq_chip = {
 	.name = "ITS-fMSI",