vndk-def: Print source directory in deps-insight

With this commit, deps-insight will be able to print the module source
directory if `--module-info` is specified.

Bug: 62898574
Test: ./vndk_definition_tool.py deps-insight --module-info ...

Change-Id: Ib4741071c759e37bed24aeee4c318b3269faa450
Merged-In: I0934d51912c69df8200aca7ea548395b9425f497
(cherry picked from commit 0ccb0bc0)