Add device_info_internal_t to device_info_generic.c.in

Open-webOS-DCO-1.0-Signed-off-by: Pekka Ropo <pekka.ropo@palm.com>

Change-Id: Ica2d7f43c16a18d7626f0b30001b12ac2749d46e
Reviewed-on: http://g2g.palm.com/1247
Reviewed-by: Build Verification
Tested-by: Pekka Ropo <pekka.ropo@palm.com>
Reviewed-by: Keith Derrick <keith.derrick@palm.com>