power: qpnp-smbcharger: add support to control hvdcp3 detection dynamically

Currently, HVDCP3 detection is enabled by default. Add support
to control it dynamically through a power supply property
"allow_hvdcp3".

If hvdcp3 adapter is connected and "allow_hvdcp3" is set to
false, it will get detected as hvdcp.

CRs-Fixed: 991060
Change-Id: Ibc1523f218fb55577c09b9b8317e5aac45d0fb6c
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>