techpack: qdsp6v2: Allow 320K AAC encoding

 * DSP supports this swimmingly.

Change-Id: I11696dd49253c5a310b32c0bfe1a878009597b24

Signed-off-by: engstk <eng.stk@sapo.pt>
Signed-off-by: Çağhan <caghandemir@gmail.com>
Signed-off-by: prorooter007 <shreyashwasnik112@gmail.com>
Signed-off-by: Jabiyeff <cebiyevanar@gmail.com>
Signed-off-by: iusmac <iusico.maxim@libero.it>
Signed-off-by: improbir <ghosh_probir@yahoo.com>