qcom-charger: smblib: drop the BOOST PFM Threshold change

The original change to set 200mV boost PFM threshold at request
of a HW workaround is no longer needed, set as default now in
SBL.  Remove it.

CRs-Fixed: 1095917
Change-Id: I4e041dafa83d935a5c16c96bea7a3ea488e80d87
Signed-off-by: Harry Yang <harryy@codeaurora.org>