Because of the android sdk managed by CIPD (see go/use-adjective-apis),
its deps repo ndk needs to be relocated, as well as hooked by the root
DEPS instead of recursedeps. This CL addes android ndk deps in
libyuv/DEPS.

Bug: chromium:659808
Change-Id: I3d83c06d108d131ea1809c79955fae39d6cc737d
Reviewed-on: https://chromium-review.googlesource.com/858433Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>