aaf: Refactor timeout routines

aaf: Refactor timeout routines

The functions aaf_mclk_timeout_playback() and aaf_mclk_timeout_capture()
have some common code so this patch does a code refactoring by moving
the shared code into a new function called aaf_timer_timeout().

After the refactoring, aaf_mclk_timeout_playback() and aaf_mclk_timeout_
capture() ended up having no code related to timeout so they were
renamed to better represent what they really do (send frames and present
frames, respectively).

Signed-off-by: Andre Guedes <andre.guedes@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>