bcm2835_audio: Remove wrong chn_intr()

[christos]

Summary

chn_trigger() calls bcmchan_trigger() with the channel lock held.
However, bcmchan_trigger() calls chn_intr(), which also tries to lock,
which results in a lock recursion panic. chn_intr() is meant to be
called by the interrupt handler and not inside CHANNEL_TRIGGER()
methods. Remove the call altogether, the bcm2835_worker_play_start()
call that comes after is enough.

Reported by: [e-mail]
Tested by: [e-mail]
Sponsored by: The FreeBSD Foundation
MFC after: 3 days

[markj]

Could you please add a Fixes tag?

Reported by: [e-mail]
Tested by: [e-mail]

It's nicer to include the person's name as well, per https://docs.freebsd.org/en/articles/committers-guide/#_include_appropriate_metadata_in_a_footer
So:

Reported by: Marco Devesas Campos <[e-mail]>
Tested by: Marco Devesas Campos <[e-mail]>