AudioPolicy: several spatializer output management fixes

Apply several fixes for spatializer output management when
the spatializer can be attached to two hardware modules (for instance
the primary and Bluetooth hardware modules).

- in getSpatializerOutput() open the output with
openOutputWithProfileAndDevice() to properly create the duplicating
output if needed and handle dynamic audio profiles.
- in openOutputWithProfileAndDevice(), do not open a duplicating output
for outputs opened on the primary module.
- in closeOutput(), clear mSpatializerOutput if this is the output being
closed.
- Allow canBeSpatialized() to ignore config matching with opened mSpatializerOutput
when not required.
- Force multichannel mixer mask in SwAudioOutputDescriptor::open() when
opening a spatializer output and the mixer config is not specified.

Bug: 210803914
Test: spatializer over Bluetooth A2DP
Change-Id: I1c5ca3ce0a230d674f3a22fcb1fe1d904665efe9
(cherry picked from commit b4f42a9b)
Merged-In: I1c5ca3ce0a230d674f3a22fcb1fe1d904665efe9