scd: internal driver: Submit SET_INTERFACE control transfer.

* scd/ccid-driver.c (ccid_open_usb_reader): Alway submit SET_INTERFACE
control transfer.

This handling is not mondatory, but it's better to do so, because
there are card reader with pinpad and token with ack button, which
support user interaction.

User interaction status should be reset at open time. The status
should be reset when the session is closed/stopped. In practice,
since cleanup routine in a driver may not be called properly, it's
good to submit SET_INTERFACE at open time.

• Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>