[WifiCoex] Define xsd_config module for parsing coex table

Define an xsd_config module for parsing the coex table XML defined by
coex_table.xsd.

Bug: 153651001
Test: build
Change-Id: Ic61cabc0cc23ad313be88d23c8e4715f1bc0c06f
7 files changed
tree: 00448ca5a0b85da90997c15a430a90ca595cc9e9
  1. apex/
  2. service/
  3. metrics_pdd_hook.py
  4. PREUPLOAD.cfg