msm: vidc: Free smem client after moving core to UNINIT

If userspace crashes prematurely, there will be a good chance that the
driver hasn't unmapped or freed certain buffers.  These buffers will be
freed in the state transition to UNINIT.  At that point the smem client
needs to be valid for the free/unmaps to be valid.

Change-Id: I089dcbd1e79f1c2a8671e5719d3a5dbc9926b252
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>
msm: vidc: Add min resolution check for video session

Add a check for minimum supported video resolution, based
on firmware capabilities and reject unsupported video sessions.

Change-Id: Ib5a4eb6e6ab66408cf13829e20d3933138f357c1
Signed-off-by: Arun Menon <avmenon@codeaurora.org>
msm: vidc: Add description of LTR Extradata

The missing string descriptor caused a mismatch in array sizes
causing the v4l2 control framework make an out of bounds access.

Change-Id: I9a9f64e16ca95163d800702d94528833f5892537
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>
msm: vidc: Query the core on VIDIOC_G_FMT

Previously we only queried the core for buffer requirements in
VIDIOC_REQBUFS, and relied on that information in _G_FMT.  However,
there's no expectation that the client calls _REQBUFS before _G_FMT,
which leads to stale information being returned as part of _G_FMT.

As such, always retreive fresh info from the core for either ioctl.

Change-Id: Ife94343f4bd4f62da7f2bef4266076ceed409bca
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>