char: Deprecate backend aliases 'tty' and 'parport'

char: Deprecate backend aliases 'tty' and 'parport'

QAPI doesn't know the aliases 'tty' and 'parport' and there is no
reason to prefer them to the real names of the backends 'serial' and
'parallel'.

Since warnings are not allowed in 'make check' output, we can't test
the deprecated alias any more. Remove it from test-char.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210311164253.338723-3-kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>