audio: Fix playback of AAC clips in offload mode instead of deep buffer

-AAC clips with duration less than the minimum required duration for offload
playback, still end up in playback through offload path.
-This is because in isOffloadSupported() call, the condition to check AAC clips
is not updated to accommodate AAC subformats.
-Update condition to accommodate AAC subformats as well.

Change-Id: Ib946830bc2f6b9cec33c8f0943910e3aeeb6fa6e