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>
KeyguardSimPinView: don't send dummy request to get remaining pin

I'm not sure of the behavior on QCOM RILs, but on Broadcom RIL
(and probably other RILs), this will eat into the user's PIN
remaining tries. Given that the user is only given ~3 tries, this
is a very bad idea.

In addition, if onAttachedToWindow is called multiple times before
the RIL replies, this can completely delete the retry quota leading
straight to the PUK screen.

Change-Id: I339f1b6d79d543ae8930a7bb95acf823fd5ae20e