qpnp-smb2: Disable hvdcp based on user configuration

Some platforms do not support HVDCP charging. Provide means to
disable them.

Provide a votable for disabling HVDCP in preparation to handle
VBUS and CC line shorted situation.

Note that when hvdcp is disabled, we only disable voltage
negotiations i.e. qc 2.0 detection remains enabled since it
does not need voltage to change.

Change-Id: Id7eaa46f08ac451a918a550f7837efbef78ab6f6
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>