Use BUILD_NUMBER_FROM_FILE instead of BUILD_NUMBER in Make.

<Two phase commits> Since internal master code has more places that use
BUILD_NUMBER (mostly in vendor/) than AOSP (conflict). We can't
deprecate BUILD_NUMBER directly. Therefore, we try to switch to
BUILD_NUMBER_FROM_FILE as much as possible at first. Then we will do
a one-off deprecation for BUILD_NUMBER in internal master next step.

Test: m -j
Bug: b/70351683
Change-Id: I14ffee7381933c9fde14c4bde8c0c14e45fe98bf