power: smb1360: Add a DT property to configure recharge SOC threshold

Add a device tree property to configure the auto-recharge SOC threshold.
This implements a SOC based resume charging strategy, device will
recharge after system SOC drops to the configured threshold.

Change-Id: I4165c119269e131cce66a1fb9d09908f13bb47f4
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>