The 8042 emulation found on Chromebooks does not support the RESET command,

The 8042 emulation found on Chromebooks does not support the RESET command,
for no good reason, and causes pckbc not to attach. However, sending a `get
keyboard id' works, so this can be used as a second check to give those
fawlty pieces of hardware a chance to work.

Based on a diff submitted by, and tested by,  Vladimir 'phcoder' Serbinenko.