drivers/staging/solo6x10/p2m.c needs slab.h

alpha allmodconfig:

drivers/staging/solo6x10/p2m.c:52: error: implicit declaration of function 'kzalloc'
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/solo6x10/p2m.c

@@ -18,6 +18,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/scatterlist.h>
 #include "solo6x10.h"