powerpc/pseries: add missing cpumask.h include file

Build error is encountered when inlcuding <asm/rtas.h> if no explicit or
implicit include of cpumask.h exists in the including file.

In file included from arch/powerpc/platforms/pseries/hotplug-pci.c:3:0:
./arch/powerpc/include/asm/rtas.h:360:34: error: unknown type name 'cpumask_var_t'
 extern int rtas_online_cpus_mask(cpumask_var_t cpus);
                                  ^
./arch/powerpc/include/asm/rtas.h:361:35: error: unknown type name 'cpumask_var_t'
 extern int rtas_offline_cpus_mask(cpumask_var_t cpus);

Fixes: 120496ac ("powerpc: Bring all threads online prior to migration/hibernation")
Signed-off-by: NTyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/rtas.h

@@ -5,6 +5,7 @@
 #include <linux/spinlock.h>
 #include <asm/page.h>
 #include <linux/time.h>
+#include <linux/cpumask.h>
 
 /*
  * Definitions for talking to the RTAS on CHRP machines.