ARM: dts: msm: Use PSCI idle low power modes on msm8952

Add support for entering idle low power modes using PSCI
for msm8952.

Also update mpm bypass list and remove lpm-workarounds.

Change-Id: I666367fb186d6103c381be9cca7205ab12e4798e
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>