Allow back-to-back AVDTP API_RECONFIG_EVT events

Based on AVDTP Spec 1.3, Section 9.8 StreamChangeParameters, the RECONFIG
procedure (AVDTP_RECONFIGURE_CMD) happens in OPEN state, and there is no
state transition that would prohibit calling the RECONFIG procedure
back-to-back.

Test: A2DP codec reconfiguration and audio play with several Sink devices
Bug: 35284763
Change-Id: Ie4ddca8545e2146fbd863e55713fd2d49994b4b0