dt-bindings: qpnp-fg-gen4: Add support for weighted capacity learning

Add support to loosen capacity learning qualifying criterion.
This helps to learn capacity from any starting battery SOC to
any ending battery SOC, provided, battery SOC changes by at least
10 % during charging. Assign weight to this capacity learning
event based on the change in battery SOC.

Change-Id: I8be35a4787460ee89c29eecf4edd1c404a8acd04
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>