Set "isdrm" info in Mediastore

The mediascanner member mIsDrm was never set
according to the drmframework canHandle call.
This subsequently caused that the isdrm column
in mediastore was never set, and was defaulted
to false for all files.
mIsDrm is now set according to drmframework
canHandle result for each files that is scanned.

Change-Id: Id557d921c4e3e3dfc35da56b69471f4bd6b3c8bf
Handle errors from AudioEffect::queryNumberEffects

There may be cases where queryNumberEffects fails leading
to the usage of the uninitialized numEffects.

Change-Id: If6d46987021ff6f0c9a2123d8714ff5fdf9ced45
NsdService: Clear client info after resolution request is serviced.

Currently, the client requests tracked in mClientIds for resolution
requests isn't cleared at all and causes failues of additional registration
and discovery requests once the number of requests reaches MAX_LIMIT. In
addition, bubble up unhandled native events to default state of nsd state
machine.

Change-Id: Ief14e0fff644aa2698fcddd71f538820f802be58
Fix typo

Change-Id: I58f863c4eb1eb4196d001c280027ab59bee51ce4