CEC: Process missing port/device select request

The timing issue cause some port/device select request
to return error if made while the service is being initialized
waking up from sleep.

This CL buffers the request so that it can be handled as
expected once the service initialization and device discovery
is completed.

Bug: 23084229
Change-Id: I8bcdaf3b708c6b9bf75ea15304c08bd35bd0f6d0
(cherry picked from commit d0b01dfe0aaebd054165dfe2f5f4bd7d68703970)