msm: vidc: Computer Vision Program (CVP) driver implementation

Computer Vision Program algorithms are required to improve 
video usecases quality. Userspace clients will use the driver
to utilize the CVP features supported by video hardware.
The driver implementation contains below functionalities

- CVP Session initialization/de-initialization
- HFI (Host Firmware Interface) Queue implementation for DSP
- Scale clocks and vote buses
- Register / Unregister buffers

Change-Id: If851401724cf15e455e17ad8a44742a01e6a87e4
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>