Revert "ARM: dts: msm: Add rpm notification bit support for msmzirc"

This reverts commit b9358b93.

On mdm9640, set SLP_CMD_MODE is causing system hang in power collapse.

Change-Id: Id3197be433bf05e075ad773e224d181641ebe229
Signed-off-by: Girish S Ghongdemath <girishsg@codeaurora.org>