scd: Improve internal CCID driver.
* scd/ccid-driver.c (scan_or_find_usb_device): Don't scan for configuration but use active configuration. Support alt_setting. (scan_or_find_devices): Support alt_setting. (ccid_open_reader): Support alt_setting.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>