Use libclang pip package instead of clang

clang pip package is not maintained anymore which makes it incompatible
with recent clang libraries. Move to libclang as it is up-to-date and
well maintained.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: Ida6eb61015645bd529e8dec880f8febef707fab9
3 files changed