ALSA: emu10k1: make available E-MU clock sources card-specific

The actually available clock sources depend on the available audio input
ports and dedicated clock input ports.

This includes refactoring the code to be data-driven to remain
manageable.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230612191325.1315854-3-oswald.buddenhagen@gmx.de


Signed-off-by: Takashi Iwai <tiwai@suse.de>