HostComputer exif field was replaced with CameraSerialNumber and IPTCNAA
field was replaced with ImageNumber.

Timing helper can be used to profile code execution from user space.
Cache invalidation is organized in tasklet and will be removed from mem
driver after some testing is performed.

This commit should not compile and was made just to save current state.
framepars and sensor_common were converted to platform dirver, some file
headers were updated and ad-hoc updates to doxygen comments were
introduced.