Add version to driver library

A version has been added to the driver library so users can check if
they are compatible with the driver library in use.

The Python wrapper has been updated accordingly to make the version
information available.

Change-Id: I8affbf7068c057f7103adf14c9e4a331d547fbcc
Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>