chg: Unconditionally enable/disable FETs

We used to cache the values.  Now, always set them, because the gas gauge
can change the FETs on its own.

Signed-off-by: Sean Cross <xobs@kosagi.com>
main: Delay for 300ms when powering on

This solves a problem where the board will power on in my bag.

Signed-off-by: Sean Cross <xobs@kosagi.com>