Revert "power: max17048: power down if the battery voltage is too low"

This reverts commit 71692bddc8b1c9e99acb8321029132df310b961f.
Revert "arm/dt: hammerhead: set power down vbatt level to 3.05V"

This reverts commit 1422013e6c9cfb8c2bfab401151d335235f577ca.