power: qpnp-fg-gen4: Support configure skew in capacity learning algorithm

Capacity learning algorithm takes in a parameter to configure
skew if when specified by the user to offset the errors that
can be accumulated based on the charging nature. Add a device
tree parameter "qcom,cl-skew" to configure it.

CRs-Fixed: 2380759
Change-Id: Ib50b175a6079261627e4038811980329e3c66668
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>