use new sdbus++ camelcase
use new sdbus++ camelcase

Change I17a8d7479556596a3cf252b3f4eae9c8df547189 will change
how sdbus++ generates names which start with an acronym.
Prepare for this by keying off the SDBUSPP_NEW_CAMELCASE
define to use the new format.

Changes:
    pOHCounter -> pohCounter

(This repository only uses this as a local variable so there
is no need for an SDBUSPP_NEW_CAMELCASE override.)

Signed-off-by: Patrick Williams <cbb7353e6d953ef360baf960c122346276c6e320@stwcx.xyz>
Change-Id: I918aed7f6ddadd21bd490a0ddb547545499646ee

openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid