Use soong_config_set instead of raw variables

soong_config_set works better with the conversion
to Starlark.

Bug: 220940864
Test: Presubmits
Change-Id: Id71c1167d43db21e42e68264a2870153f850c9f8
Merged-In: Id71c1167d43db21e42e68264a2870153f850c9f8
1 file changed