AOSP: Change P2P_MAX_CLIENT_IDLE 10 --> 20

AOSP: Change P2P_MAX_CLIENT_IDLE 10 --> 20

This came in as a part of this AOSP commit:

commit 98f9e76624da6bb96edc1982c423e4a119c5170a
Author: Dmitry Shmidt <dimitrysh@google.com>
Date:   Wed May 30 11:18:46 2012 -0700

    wpa_supplicant: Update to Version 0.8.27 from BRCM

    - Fix crash during TRUE pbc overlap
    - Fix p2p_stop_find event
    - Avoid race condition in GO-NEG process if both peers enter
      p2p_connect at the same time
    - Retry assoc immediately on ASSOC-REJECT. Previously assoc was
      retried on authentication timeout (which occurs after 10secs).
      Now on assoc reject, we cancel the auth timer and then initiate
      a assoc scan.

    BUG: 6543705, 6427094

    Change-Id: I4489fb14b6cead069f0d14fcbb9e2224f790d77b
    Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>