samsung_qcom-common: use device powerhal

fixes the mpdecision mess.

Revert "qcom-common: TARGET_POWERHAL_VARIANT = cm"

This reverts commit 25fa1552e6dde70e89f99c35511a68311f3c8b3a.

Revert "qcom-common: Don't use CM PowerHAL for all targets"

This reverts commit cbd3c9d41eafbe3a54aaf52612e10df0e02b2a34.

Revert "qcom-common: use CM PowerHAL"

This reverts commit 5760d031c7a0e31a76693fd150eb63bdbcb42bfc.

Change-Id: I49373f20d07e6a224b3990e8eafa9a63cee8dbc6