qcom-charger: qpnp-smb2: use values from hardware for default settings

Currently some hardware default charge settings are modified with
software default charge settings. Remove the software default settings,
and use only the device tree properties for changing the hardware
defaults.

Change-Id: I02a0cbbf547aacc5e813d027a2f3623cc01e1dd6
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>