power: smb5: Add property to limit QC2.0 input current

Some QC2.0 adapters collapse with 3A ICL, add a logic to
limit the ICL to 2A.
Use DT property "qcom,hvdcp2-max-icl-ua" to limit the value.

Change-Id: Ia03c971f388470e5b5770d6e7271e3298c84db57
Signed-off-by: Umang Chheda <uchheda@codeaurora.org>