[lotus-zephyr] Bug in power slider mode management

[DHowett]

I think the code here is wrong as of 42ec4cc58fad9f9f3f6f350b9a9566576137ccbd.

https://github.com/FrameworkComputer/EmbeddedController/blob/42ec4cc58fad9f9f3f6f350b9a9566576137ccbd/zephyr/program/lotus/azalea/src/cpu_power.c#L286-L290

mode = mode << 4 will produce out-of-range values for the AC modes: EC_AC_BEST_PERFORMANCE will become 256 (16 << 4), EC_AC_BALANCED (32) will become 512, etc.

Reading the condition, it looks like we want to treat low-power AC (AC < 55W) as the same as DC. I would expect that to downgrade EC_AC_BEST_PERFORMANCE to EC_**DC**_BEST_PERFORMANCE (as an example).

If that's the case, I suspect mode >> 4 is what you want. That reduces EC_AC_BEST_PERFORMANCE to 1 (16 >> 4)... which happens to match the value for EC_DC_BEST_...