Revert "msm: spm: set vdd directly for current cpu"

This reverts commit a0a13f7a8f0ffa7296b64f9e4f4d56d8969b5594.
Revert "msm: avs: Restore core voltage when disabling AVS"

This reverts commit 5f267ec00c2f014dc82b18cd4b45bafe87fca572.