msm: camera: isp: Add master-slave capability to vfe driver

Add dual_hw MASTER and SLAVE tags to vfe_src.
Add info to src on ioctl and remove it during stop_axi.
Also maintain the same info in common_data.
This change adds the framework needed to use VFE src in
Master-Slave mode.

Change-Id: I41b210ed1ff7a7d26510a78590e62f46f4a3ca1c
Signed-off-by: Harsh Shah <harshs@codeaurora.org>