bin/reform-hw-setup: select soundcard by name, not by number

This is necessary for rk3588 where there is now also HDMI audio which shows up as card 0 and wm8960 becomes card 1.

Closes: bugs/bugs#41 (closed) Link: https://community.mnt.re/t/rk3588-upgrade-no-audio-from-built-in-speakers/3640/5