ANDROID: Add checkpatch target.

Running the following will run scripts/checkpatch.pl on a
patch of HEAD

  tools/bazel run //common:checkpatch

or a given Git SHA1:

  tools/bazel run //common:checkpatch -- --git_sha1 ...

For additional flags, see

  tools/bazel run //common:checkpatch -- --help

For details, see
  build/kernel/kleaf/docs/checkpatch.md
in your source tree.

Test: TH
Bug: 259995152
Change-Id: Iaad8fd69508cf9be11340166aafbb84930d4805c
Signed-off-by: Yifan Hong <elsk@google.com>