power: smb135x-charger: Add interface to disable soft current compensation

JEITA soft current compensation is used to reduce charging current if
temperature exceeds the soft thresholds. Add a property
"qcom,soft-current-comp-disabled" to allow disabling it.

CRs-Fixed: 802333
Signed-off-by: Zhenhua Huang <zhenhuah@codeaurora.org>
Change-Id: I177629f2a39300a39971f517f7a7b45e6185d9d9