Add additional overriding methods to signature files

This change adds overriding methods that are essential to compile the
stubs generated from the signature files.

More information and the background for this change is available at go/add-overriding-one-pager.

Test: m checkbuild --build-from-text-stub
Bug: 299366704
(cherry picked from https://android-review.googlesource.com/q/commit:f1c80d341c5c70b3649d5ac6c7afb3ee3b47ef23)
Merged-In: I72ec7af2b0c122c4e61e9f675f3f588ed0448d52
Change-Id: I72ec7af2b0c122c4e61e9f675f3f588ed0448d52
8 files changed
tree: 0dd1564dd30a0fd9af99c4f1b7d88ead03a2b120
  1. apex/
  2. framework/
  3. service/