ALSA: scarlett2: Allow selecting config_set by firmware version

ALSA: scarlett2: Allow selecting config_set by firmware version

The Scarlett 2i2 Gen 4 firmware 2417 moved the direct monitor gain
parameters, so we now need to allow each device to list multiple
scarlett2_config_set entries, one per applicable firmware version
range, and pick the matching one at probe time.

No functional change yet: each device gets a single config_sets
entry whose from_firmware_version matches the existing
min_firmware_version (0 where none was set). This both prepares for
selection and lets a follow-up commit remove the now-redundant
min_firmware_version field.

scarlett2_count_io() depends on the resolved config_set so it moves
out of scarlett2_init_private() into snd_scarlett2_controls_create()
after the firmware version has been read.

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/ae1695b4c4825f365b4c86b22174035f742807e3.1777151532.git.g@b4.vu