smartcard: creating SmartCardChannelClient type

The lifetime of the channel is not necessarily correlated to the life
time of the device. In the next patch, we need to keep a reference
to SpiceCharDeviceWriteBuffer, which might be in use even if the
SpiceCharDeviceState is destroyed, but the channel is still connected.
The next patch keeps this reference inside SmartCardChannelClient.

This patch also removes the routine smartcard_readers_detach_all(rcc), which
is unnecessary since we don't support multiple readers; even when
we do support them, each channel client should be associated with only
one reader (i.e., we will have different channels for different
readers).

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