PM / devfreq: bw_hwmon: Add support for BWMON5 monitors

Add support for the fifth type of bandwidth monitor. This monitor
is similar to the other types of monitors, but the register
offset is slightly different, and it doesn't have a global
interrupt base.

Change-Id: Ib05602832b6d4712b783ebaaa5aae9e60c00e30b
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>