ARM: dts: msm: Set floor BW vote based on CPU freq for MSM8939 V3.0

This will make sure that at any point of time BW vote will not
go below the limit set by mincpubw. cpubw node uses BIMC_MON governor
and will vote higher depends on the requirement. The bus driver will
aggregate votes and take the highest of these.

Change-Id: Ib6a7a470bd50c63909f4750bee41a8377e39b0b7
Signed-off-by: Arun KS <arunks@codeaurora.org>
Signed-off-by: Hanumath Prasad <hpprasad@codeaurora.org>
Signed-off-by: Bharat Pawar <bpawar@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>