Change SQL to improve performance.

To know the number of images, use "COUNT(*)" instead of "_id" in SQL.
Using "_id" gets all result set. and when getCount() is called, CursorWindow is filled.
But using "COUNT(*)" gets just 1by1 data.
So using "COUNT(*)" is more faster than now.
And this SQL is called everytime per a file during a file transfer in MTP
The better way is by using "EXIST".
But if using "EXIST", modify MediaProvider.call() method.
So i applied just a "COUNT(*)"

Change-Id: Ic5882af0fad2304f836b7b7043a4746359391609
Signed-off-by: muzbit.kim <muzbit.kim@lge.com>
Forward Port: Hide USB Debugging Icon [1/2]

Change-Id: Ibd63a9df207ddfb67dc16fbd44697261a9f6f0b4
Forward Port: Add Camera sound toggle [1/3]

Change-Id: I9e90f606d528eea08a41c35e75cd189e765c5d97
MediaScanner behavior on boot (1/3)

Lets you enable/disable/ask (with a notification) media scanning on boot.
Can speed up boot and reduce initial boot lag from MediaScanner

Change-Id: I634ae96b1dcb493b966b4653589cd97523b63da7
Forward Port: Volume button seek on screen off [1/2]

Change-Id: Id55a1240a133b5144502fced862bae040b390662
Forward Port: Hold Back kill App [1/2]

Change-Id: Ia58d6bbf223f44103c7997f059435758f12912ce

Conflicts:
	core/res/res/values/config.xml
Fix build error

Change-Id: I926a1f9ded766024552eb01b5f4f3051487dbc15