[PATCH] Fix proximity sensor under low light.

    From b80e9ee64cd86d88815fc721572c51c9210883ba Mon Sep 17 00:00:00 2001
    From: Thomas Wendt <thoemy@gmx.net>
    Date: Sat, 9 Feb 2013 16:49:48 +0100

    If the ambient light is too low the proximity sensor always reports "near"
    which causes the screen to be immediately turned off when starting a call.
    It is not possible to turn the screen on again until the other end hangs up.
    Change the proximity sensor config to fix this.