Revert "arm/dt: hammerhead: set power down vbatt level to 3.05V"

This reverts commit 1b02799138f41edd2927f36d2c8c35430accb4fd.
Revert "power: max17048: power down if the battery voltage is too low"

This reverts commit 6fe39138c04f64f1cfc9720d27cd267ea9f2baa3.
hells_defconfig: hC-MIUI-b3.6