power: qpnp-smbcharger: charge at 3A for HVDCP chargers

Allow the charger to pull 3A of charge current from HVDCP chargers,
since they are certified to handle that much current.

CRs-Fixed: 918587
Change-Id: I411da6ffe0756ed8c3f3b23d1ed13cd31dbb7fa1
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>