Revert "ANDROID: add .bazelignore file"

This reverts commit 6ce0e9e8.

Reason for revert: the cl pollutes the source tree

Bug: 296486873
Bug: 448146279
Change-Id: I4fad93988d80cdc8205a7177ddd0b143f3f382bc
Signed-off-by: Cheng-Cheng Lo <locc@google.com>