hal: add support for FFV get params

-Audio HAL to support FFV get_paramters via sound trigger
callback.

-FFV needs clients to pass down the SM handle info to get a few
paramerters with respect to the given SM handle but standard
get_parameters doesn't support kvpairs for input keys, it does
support for return of kvpairs, add support for a new delimiter
which will be used while sending keys in get_parameter.

-Enable Keep alive for Red Dragon

-Adjust volume gains based on the systems team tuned values

Change-Id: I96c7214b4a084568862e3550eaabbb9d51e253d9