Add reference to nct6683 driver.
Show that nct6775 driver supports NCT6792D.
Show that NCT6102D/6104D/6106D are supported by nct6775 driver.
NCT5573D is compatible to NCT6776F and has the same chip ID.
sensors-detect: EMC14xx chip updates

Document support for EMC1402, EMC1404, and EMC1424
Detect new revisions of EMC14xx
Add detection of EMC1422