Revert "ALSA: usb-audio: Fix last interface check for registration"

This reverts commit 28787ff9 which is
commit 39efc9c8 upstream.

It breaks the abi and is not needed for Android devices as udev is not
used with them.  If it is needed to be added later on, it can come back
in an abi-stable way.

Bug: 161946584
Change-Id: Iccf323eca97ca9581b64b2703e3652f399c88479
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>