Add support for C166 family of micro controllers

[plafosse]

Datasheet here:

c166ism.pdf

This covers the following variants:

• C161K, C161O, C161PI
• C161CS, C161JC, C161JI
• C163
• C164CI, C164SI, C164CM, C164SM
• C165
• C167CR, C167SR
• C167CS
• SAB 80C166, SAB 80C166W
• SAB 83C166, SAB 83C166W