Setting the default value for dock audio

There was no default value for parameter "dock_audio_media_enabled"
in global settings and because of that it couldn't be obtained before
Settings app first start and improper actions, such as FORCE_NONE
sending to AudioSystem instead of FORCE_ANALOG_DOCK, were taken.
This patch sets default value to 'true'.

Change-Id: Idbe343519db15f806f3a237e8b39f8420b9edde1
Signed-off-by: Dmytro Dubovyk <dmytro.dubovyk@ti.com>

Conflicts:
	packages/SettingsProvider/res/values/defaults.xml
[1/2] Power connect/disconnect notification support

part 1/2: frameworks/base PowerUI and Settings
http://review.cyanogenmod.org/#/c/35241/

part 2/2: packages/apps/Settings Sound settings
http://review.cyanogenmod.org/#/c/35242/

patchset 3:
    shrink a couple of long lines
    remove power_notifications_use_default option (folded into ringtone option)
    load default settings in global instead of system

patchset 5:
    support vibrate toggle
    ignore first power state change (on boot) if it's a DISCONNECT

patchset 6:
    fix ignore first power state change

patchset 7:
    change vibrate to default to off
    simplify first power state change ignore logic

Change-Id: I36a6b9f924d2cd52191a8e83a744745b37c5b068