Revert "ALSA: usb-audio: Improve frames size computation"

This reverts commit 2d50acd7 which is
commit f0bd62b64016508938df9babe47f65c2c727d25c upstream as it changes
the in-kernel ABI in a way we are not ready to handle just yet.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I0f128103f8d1219ece75ed14106cbd079d3bd2f4