Fix accesses to IT8792E

Fix accesses to IT8792E

If IT8792E or a compatible chip such as IT8795 (which has the same chip ID,
0x8733) resides at SIO address 0x4e/0x4f, and another Super-IO chip is at
SIO address 0x2e/0x2f, the IT8792E causes a cycle decode problem when exiting
its configuration mode. This can result in access errors for both chips, and
may result in system hangs.

Never exit configuration mode for IT8792E to avoid the problem.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>