audio policy: improve sharing input logic to prevent temp unrouting

When a client is active on an input with a given input source, and
when another client is starting on the same input profile with same
source (so same priority), the first client input will be closed.

If the client is using AudioRecord, it will recover by restoreRecord,
and hence (re) started in the same input as the preemptor. Input
will now be "reused" (and not "closed") as the current client was set
as the preemptor.

Bug: 303079083
Test: atest audiopolicy_tests:AudioPolicyManagerInputPreemptionTest
Flag: com.android.media.audioserver.fix_input_sharing_logic

Signed-off-by: François Gaffie <francois.gaffie@ampere.cars>
(cherry picked from https://android-review.googlesource.com/q/commit:2a68ef65fa01aa737bc528f7d4329f5d1909b2b1)
Merged-In: I68ef45833fd04886b80c6f7610043e6ba37036cd
Change-Id: I68ef45833fd04886b80c6f7610043e6ba37036cd