Make --blkid_path argument optional

This has been a no-op argument. In this change, it becomes optional.

This is a preparation step for removing the argument. There'll be more
follow-up changes removing argument passing.

Bug: 279858383
Test: atest apex_compression_test (which uses deapexer)
(cherry picked from https://android-review.googlesource.com/q/commit:ca73282b4b984755c88371d4d35571f1ed463df5)
Merged-In: Ie09963c52a1b55d82f4e3565de10192364d29380
Change-Id: Ie09963c52a1b55d82f4e3565de10192364d29380
1 file changed