Fix Cherry Trail power management regression

I noticed, starting with Linux 4.17, that power management for my GPD Pocket UMPCs ceased working: acpi(1) and sensors(1) stopped reporting anything, fan control ceased so the fan ran at full speed all the time, USB-C charging dropped to 5V, and a number of power management related LKMs were no longer autoloading at boot, nor did they find the hardware if I modprobed them manually. I finally found time to track down the cause, and the additional breaking changes which had also occurred in the meantime. Compiling a 5.8rc6-1exp1 package with these commits applied seems to get things back in working order.