camera: Ignore CAF_RESTART callbacks

 * Ignore these callbacks which are sent by Samsung camera drivers, as
   they can cause a deadlock in normal operation.

Change-Id: Iae59eb0d3050751c1a4d372c80d430a8ba957252
libstagefright: Add support to seek to zero

- Add CAN_SEEK_TO_ZERO flag in MediaExtractor to allow
  seek to zero, when previous button is pressed, for clip
  that can't be seeked.

Change-Id: Ic2761cc5bac2403ee1339da77ad02fde942a3437
Fix potential NULL pointer deference in ToneGenerator destructor

Initial members in ToneGenerator so destructor can free
allocation properly.

Change-Id: I4a686084af48f99d2eefc33e56e3239846d3d34f
libstagefright: Check for duration > 0 to avoid DivideByZero crash

- duration = 0 can cause divide by zero and for this clip duration
  is indiacted as 0.
- check for duration > 0 rather than duration >= 0

Change-Id: I58ccacbf7ede892dff9626715162ea7b1f2ddbc6
CRs-Fixed: 451855
libstagefright: Fix incorrectness nPortIndex value for QueryCodec
                The query index is wrong, it will make a death loop in
my ME722 when get resource thumbnail for MPEG4 video.

Change-Id: I64532156e762b847a8eae59560fb828549c29519
MediaScanner: Ignore dirs with .noscanandnomtp

Completely ignore directories with .noscanandnomtp files
in them. Placing a .nomedia file will still scan a
directory but exclude it from the media database. This
is so the file may still be presented for MTP purposes.

Placing .noscanandnomtp completely prevents the scan,
which saves considerable processing power and battery
life on systems with numerous media files, but prevents
them from being seen over MTP.

Change-Id: Ibff2a9f2525255a2ac34132eeee36734962fbdd7