Revert "android: binder: Change binder mutex to rtmutex."

This reverts commit ebce7cd30b3e00232c8be23d0f04d7c0599089b5.

This ends up doing more damage than good on most devices. Go back to
using a standard mutex.

Signed-off-by: Riley Andrews <riandrews@google.com>
Bug: 23036902
Change-Id: I77f2ce99533d884f6c2fb967c0c449a02c5702d7
1 file changed