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Update GATT channel state to closing during disconnection
This change ensures that the GATT channel state is moved to CLOSING state while GATT disconnect is requested by the host, specifically when the GATT state is OPEN. This is needed to prevent any furthur GATT operations, once GATT disconnect is issued. Change-Id: I8511caa477881de4f4eaf18b84f23530e1958fe9