aconfigd rust conversion part 11

Merge get_files_digest from util.rs file to utils.rs file. Also update
modules to use this util function.

Bug: b/327170179
Test atest -c

Change-Id: I74ef56eb9d357776c3a1e6492b2dcade03209953
8 files changed
tree: 4fdd94963fbb62b218977c054e12528a44ed2e17
  1. aconfigd/
  2. apex/
  3. framework/
  4. service/
  5. OWNERS
  6. TEST_MAPPING