Overlay: update download links for MahdiCenter
wlan: Improve W-Fi data transmission stablity

Update gDataInactivityTimeout parameters from 20 to 200ms to improve
wifi throughput when DUT connect to Broadcom solution Mobile Hotspot.

All credits go to XDA-member kalo86
http://forum.xda-developers.com/nexus-4/development/wifi-fix-updated-nexus-4-wireless-t2300873

Change-Id: I6541b439d6aebad5ff8e9b461ceaad7cbd338da7
Merge branch 'kk-4.4' of https://github.com/Mahdi-Rom/android_device_lge_mako into HEAD
Revert "Overlay: update download links for MahdiCenter"

This reverts commit 361df367f083054829c43ad1ba5f00d306128af0.
Revert "OTACenter: update download link"

This reverts commit e7bc6655dd5c2ec219797808bce5f7dc942b7aa0.
Revert "add MahdiCenter overlay for download link"

This reverts commit c1154d2112fe3014d372f270f6cb75e228f82b5a.
mako: enable echo cancellation for voice communication

This greatly improves the quality of VoIP calls, tested on the app
"LINE". Without this, the other party will be able to hear echo
of their own voice.

Reference: http://source.android.com/devices/audio_implement.html#preprocessing

Change-Id: Id0ccb732778ecc8d4c9e140249ec230654f351cc