drivers/misc/pti.c: add missing includes

Found on allmodconfig build (ARCH=alpha)

drivers/misc/pti.c: In function 'get_id':
drivers/misc/pti.c:249: error: implicit declaration of function 'kmalloc'
drivers/misc/pti.c: In function 'pti_char_write':
drivers/misc/pti.c:658: error: implicit declaration of function 'copy_from_user'

Signed-off-by: Sergei Trofimovich <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: J Freyensee <[e-mail]>
Cc: Jeremy Rocher <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/misc/pti.c

···
 #include <linux/mutex.h>
 #include <linux/miscdevice.h>
 #include <linux/pti.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
 
 #define DRIVERNAME		"pti"
 #define PCINAME			"pciPTI"