Implement fix for BULK IN-token retry mechanism. When the hardware is
programmed for infinite IN token retry after NAK, the SAF1761
hardware, however, does not retry the IN-token. This problem is
described in the SAF1761 errata, section 18.1.1.

While at it:

• Add some minor chip specific initialization for RTEMS.
• Add debug print for status registers in the interrupt filter.

Submitted by: Christian Mauderer <christian.mauderer@embedded-brains.de>
MFC after: 1 week