Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Updates for I2C devices on XLR engg boards.

- ds1374u : use multi-byte write.
- at24co2n, max6657: remove mutex, iicbus has the necessary locking.

Submitted by: Sreekanth M. S. (kanthms at netlogicmicro com)

I2C drivers for XLR/XLS processors.

- Major update to xlr_i2c.c: do multi-byte ops correctly, remove unnecessary
code, add mutex to protect bus operations, style(9) fixes.
- Drivers for I2C devices on XLR/XLS engineering boards, ds1374u RTC, max6657
temparature sensor and at24co2n EEPROM.

Submitted by: Sreekanth M. S. (kanthms at netlogicmicro com)