vah264enc: Enable parameters change while running.

vah264enc: Enable parameters change while running.

1. Removes the verification if the internal encoder is not opened
   yet to allow the property setting.

2. And toggles on the base class' reconf flag for each property
   variable that can be modified at run time.

3. Mark those modifiable properties as mutable while playing.

Currently the run-time modifiable properties are:

qpi, qpp, qpb, bitrate, target percentage, target usage and rate control

Other properties can be enabled too, but they need testing.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2466>