Add support for bankstown

[Tungsten842]

Speakers found in small devices have trouble reproducing bass and sub-bass faithfully. This is because they are power and space constrained, and cannot move the amount of air required to reproduce such low frequencies at audible volumes. Designers of modern devices get around this problem by taking advantage of the fact that humans are very easy to fool. We generate harmonics of bass and sub-bass frequencies to trick the human brain into thinking there is more bass than there really is.

https://github.com/chadmed/bankstown
https://crates.io/crates/bankstown-lv2

[wwmm]

The bass enhancer available in EasyEffects also uses a psychoacoustic model. It does not seem necessary to add another one.