mm-video-v4l2: change bitmask logic to handle only 64 bits

Bitmask logic is being used by both encoder and decoder to track
input / output buffers and also to set OMX component state. This
change allows bitmask logic to handle only 64 bits instead of
array.

CRs-Fixed: 2296131
Change-Id: Ia287260799f348f87215c39bf513cbc473c6f87f
3 files changed