power: qpnp-smbcharger: separate current setting for hvdcp and hvdcp3

Currently the driver only allows for a single input current setting
for hvdcp and hvdcp 3.0. Create separate module parameters for them
and set the hvdcp current limit to 1.8 Amps.

The underlying reason is hvdcp aren't high in wattage, so it is prudent
to set the input current limit to a lower, more realistic value.

CRs-Fixed: 948903
Change-Id: I26a8b7946291e317fa56738182e4320475cb0dd9
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>