Staging: crystalhd: fix build on powerpc

Add necessary include to fix build on PowerPC

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/crystalhd/crystalhd_lnx.h b/drivers/staging/crystalhd/crystalhd_lnx.h
index d3f9fc4..d338ae9 100644
--- a/drivers/staging/crystalhd/crystalhd_lnx.h
+++ b/drivers/staging/crystalhd/crystalhd_lnx.h
@@ -40,6 +40,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/pagemap.h>
+#include <linux/vmalloc.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>