ARM: dts: msm: update low power mode parameters for msm8939

Update the low power mode parameters for msm8939 with the
values measured at new min frequencies for the both the clusters.

Change-Id: Ib0b7df0387e731a6cbcb52998c48a2c86b117f65
Signed-off-by: Anil kumar mamidala <amami@codeaurora.org>