msm: vidc: add input check for hfi q6 function.

The input parameters may be null. This change adds input checks at
function q6_hfi_iface_eventq_read

Signed-off-by: Prasad Nallani <pnalla@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm: vidc: Add entry to scale buses for True 4k @ 24 fps

We weren't asking for enough bandwidth for 4k (3840x2160) @ 30 fps
sessions because we were missing an entry for True 4k @ 24 fps (which
requires less bandwith).  Now sessions of the former type are mapped to
the right ab-ib values.

Also get rid of some unused macros in msm_vidc_common.c

Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
add miss define
ARM: dts: msm: Update MDP writeback QoS configuration

Right now, writeback QoS registers are being programmed dynamically
when respective paths are being exercised. Starting 8916, wb QoS
is starting to differ from other chip-sets and since these are
chip-set specific settings, hence configure them using device-tree.

Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

Conflicts:
	arch/arm/boot/dts/msm8974-mdss.dtsi