Added a camera subfolder for the UAPI headers to be located in.
This prevents the camera UAPI headers from overwriting upstream kernel
headers.
CRs-Fixed: 2554484
Change-Id: Ie1edbfe585bbd428a6e5d1a40b438d22bd7c06c0
Signed-off-by: Karthik Jayakumar <kjayakum@codeaurora.org>