arm/dt: msm8974: Modify values for low power modes

Setup preliminary latency, power and energy values for different low power
modes on 8974. These values are used to decide on a low power mode for a
given amount of sleep time.

Change-Id: I29bba09724535ebb61309721c65829db436dba2a
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>