ALSA: emu10k1: move snd_emu1010_load_firmware_entry() to io.c

It is a low-level I/O access function, so io.c is the natural place for
it.

While we're moving the code, reduce the scope of some variables, use
compound assignment operators, and add/adjust some comments.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Message-ID: <20240428093717.3198716-4-oswald.buddenhagen@gmx.de>