frameworks/base: stop find before issuing wps pbc.

Stop p2p find before issuing a PBC to avoid GO switching to other
channel leading connection failure.

Change-Id: I88906f944de1c85b143f96cb7b35724af19cd151
Signed-off-by: Deepthi Gowri <deepthi@codeaurora.org>
Merge "frameworks/base: stop find before issuing wps pbc." into jb42