libaudiohal@aidl: Fix Hal2AidlMapper::updateDynamicMixPorts

'updateDynamicMixPorts' iterates over 'mDynamicMixPortIds' and
calls 'updateAudioPort' which can modify the vector and thus
invalidate the iterator.

Make a copy of 'mDynamicMixPortIds' to ensure that the vector
we are iterating on remains untouched.

Bug: 367117623
Test: atest CoreAudioHalAidlTest
Change-Id: I14fdd62ef23b2e96c93717c00e6fa4f7948e5932