Pull up following revision(s) (requested by nat in ticket #240):

usr.sbin/bta2dpd/bta2dpd/sbc_encode.c: revision 1.12
usr.sbin/bta2dpd/bta2dpd/sbc_encode.c: revision 1.13

Add thottling when playing from file.
This avoids rapid playback when playing from file with affected devices.

Playback using pad(4) is still preferred ad gives a better result.

Playback from pad(4) is unaffected by this change.

Reorder for readability.
No functional change intended.

(martin)