scd: Improve internal CCID driver.
* scd/ccid-driver.c (scan_or_find_usb_device): Fix return value. Support device with multiple CCID interfaces. Fix the case with READERNO. Support partial string match of "reader-port" like PC/SC driver.
I don't know any device with multiple CCID interfaces, though.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>