gn2bp: tweak //tools/grit/grit.py

* grit.py requires dependencies using depfile that are written by stamp_grit_sources.py. stamp_grit_sources.py lists all of the python files in the grit directory so this changes does a glob and adds 'six.py'.
* Fix incorrect variable by using $(location var)

Test: m cronet_aml_net_net
Change-Id: I845cb7f50252534af05dcc6d1f717c1eea936933
2 files changed