Add taskstats.h to kbuild

Add taskstats.h to include/linux/Kbuild, make headers_install would then
pickup taskstats.h.  This needs to be done as taskstats.h is a user
interface header.

Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Cc: Don Zickus <dzickus@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/Kbuild

@@ -141,6 +141,7 @@ header-y += sockios.h
 header-y += som.h
 header-y += sound.h
 header-y += synclink.h
+header-y += taskstats.h
 header-y += telephony.h
 header-y += termios.h
 header-y += ticable.h