tc: take user input for export variables for DDK

it includes:
 * cleanup while integration of unification changes
 * cloning android device profile in envsetup.sh to
   make XML independent of device profile
 * sync mali DDK only if user has access to the source by
   exporting license and source path information
 * updated README.md

Signed-off-by: Rupinderjit Singh <rupinderjit.singh@arm.com>
Change-Id: I01d7ac65fd08946fa7fa5cc56c7dfff82056894d