def-tool: Add APEX module support

This commit adds APEX module support to VNDK definition tool.

Test: ./tests/run.sh
Test: Run vndk_definition_tool.py on latest walleye
Test: Run vndk_definition_tool.py on latest aosp_arm64

Bug: 126126189
Change-Id: Ib92e7b058a3fee3520b612e053751d380cf448cd
8 files changed