ARM: dts: msm: disable pm qos for ufs in msm8996

The current implementation of the pm qos in ufs driver is not optimal.
There is a newer optimal solution being worked on but in the meantime
to enable performance measurements, disable the current pm qos.

Change-Id: I2d54fdaf5bc6ea171b75e2902cf53aeae1ea0882
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>