ARM: dts: msm: List all possible BW levels in cpubw for 8974 and 8084

With the cpubw_hwmon devfreq governor available in Krait based CPUs, it's
important to list all the possible BW levels to get all the benefit from
the cpubw_hwmon governor. Also fix the use of a non-existent BW level in
msm-cpufreq device.

Change-Id: I36f1b2ea59d643106a86b753e5a7a2eed07dab19
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>