Revert "Import broadcast_ring.h from GVR"

This reverts commit e5c34974.

Reason for revert: Failing SDK target, see

https://android-build.googleplex.com/builds/quarterdeck?branch=git_master&target=sdk_phone_armv7-sdk_mac&lkgb=3906845&fkbb=3908362

Seems fix should be something like this:
https://android-review.googlesource.com/#/c/316195/1/src/code-buffer-vixl.cc

Anyway, I am not native code expert, so going to revert this :)

Test: treehugger only

Change-Id: Iba00bec4c2c8667dffd96f90a57948c827c4a6a3