pcm: route: Use get/put labels for all 3 byte formats

pcm: route: Use get/put labels for all 3 byte formats

So far, use_getput flag is set only when the src or dest format is
24bit physical width.  But, also 18 and 20 bit physical width formats
should set the flag, too.  This patch makes the check broader to cover
all 3 bytes formats.

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