[enh] I2C salve mode support from code of Z80; see http://forum.chibios.org/phpbb/viewtopic.php?f=14&t=786
[init] created IWDGv1 driver for independant Watchdog
[fix] IWDG driver compile problem. Header include cleaned
[fix] modified the iwdgStart() function to respect ChibiOS's API style