PM / devfreq: governor_bw_hwmon: Find the correct hwmon for a devfreq dev

The governor pointer match is only present to support legacy BW HW monitors
(Krait) to maintain the legacy governor name. The newer BW HW monitor
devices do the matching using device pointer or of_node. So, the governor
pointer should not be checked if the BW HW monitor devices provide device
or of_node pointers.

Change-Id: Ic48f53e39a9b176b7dec415489bd1657d0df02e2
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>