ARM: dts: qcom: Update pm qos latency value for sm6150

For pm qos latency on sm6150, sm8150 was followed in commit <07e861d2>
("ARM: dts: Enable bus voting and PM QoS for sm6150 platform").
This need to be update as per sdm670 where pm qos latency value is
different than sm8150.

Change-Id: I8432d2fdc443cfedaab81d47bd66804993a8667e
Signed-off-by: Ram Prakash Gupta <rampraka@codeaurora.org>