ALSA: usb-audio: Add midi2_ump_probe option

Add a new option to enable/disable the UMP Endpoint probing.
Some firmware seems screwed up when such a new command issued, and
this option allows user to suppress it.

Link: https://lore.kernel.org/r/20230612081054.17200-5-tiwai@suse.de


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