Refactor GetMultiDexLocation and GetMultiDexSuffix

Order the arguments in the expected (printed) order.

Try to reduce manual parsing based on kMultiDexSeparator in callers.

Bug: 455778210
Test: TH
Flag: EXEMPT PURE_REFACTOR
Change-Id: Ie1dd1e7e64e7620be9b6c0e1ac05c9adc84099b4
12 files changed