host: update testbench to handle components properly

Since #1167 comp inits are not exported so testbench cannot get them with dlsym

@singalsu

I prefer to change logic to load all types of components from comp_init section instead of having hardcoded names for each of them like it is now.

@singalsu Are you ok with that?

@jajanusz

@jajanusz ack, lets load all types from the init section

@jajanusz

@jajanusz yes I think it makes sense. Thanks!

Fixed in #1227

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