caif: bugfix - add caif headers for userspace usage.

Add caif_socket.h and if_caif.h to the kernel header files
exported for use by userspace.

Signed-off-by: Sjur Braendeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 2296d8b..b0ada6f 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -1,5 +1,6 @@
 header-y += byteorder/
 header-y += can/
+header-y += caif/
 header-y += dvb/
 header-y += hdlc/
 header-y += isdn/