Convert system_compatibility_matrix.xml to soong

Bug: 342336921
Test: m system_compatibility_matrix.xml
Test: Modified build/release/flag_declarations/RELEASE_AIDL_USE_UNFROZEN.textproto \
      m system_compatibility_matrix.xml

Change-Id: I181c2054adb187332b3feb634e309a3e75425611
2 files changed