fast_charge: Show 0 as a valid fast charge level

* Disables fast charge.

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
ghost: Set fast charge to AC on boot

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
ghost: Disable software CRCs and FSync on boot

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
ghost: stock: Revert bulk of CAF patches and reverts

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>