Revert "ARM: dts: Disable RPM notifications for L2 GDHS collapse on Krait targets"

This reverts commit 3b337875a511188ac7dcd8b35b25d2962c12aff9.

Change-Id: I14e3603455ce27ad0570a2e2744497dd6c367301
Revert "msm: lpm_levels: remove rpm handshake in l2_gdhs mode"

This reverts commit a39a33514da9277b9725f5fd9beec734c9adf5af.

Change-Id: I946cc6e86874d214f68eb4518e78f4a9d1063b4d