Pstate: Remove legacy VDM code

- Remove legacy VDM code in preparation for actual VDM enablement commit
- VDM enablement only occurs during istep15
- Does not introduce any inter-platform dependencies

Change-Id: I5770c5ff5c8e209c07444e7962c4d0d2867e2ccc
Original-Change-Id: Ia46661f6133e2556bee0464a95c7109658a86beb
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/40185
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: Michael S. Floyd <mfloyd@us.ibm.com>
Reviewed-by: Brian T. Vanderpool <vanderp@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>

import/chips/p9/procedures/ppe_closed/cme/stop_cme/p9_cme_stop_entry.c

@@ -733,10 +733,6 @@ p9_cme_stop_entry()
         PK_TRACE("Drop sdis_n(flushing LCBES condition) via CPLT_CONF0[34]");
         CME_PUTSCOM(C_CPLT_CONF0_CLEAR, core, BIT64(34));
 
-        /// @todo RTC166918 add VDM_ENABLE attribute control
-        PK_TRACE("Drop vdm enable via CPPM_VDMCR[0]");
-        CME_PUTSCOM(PPM_VDMCR_CLR, core, BIT64(0));
-
         PK_TRACE("Copy PECE CME sample to PPM Shadow via PECES");
 
         if (core & CME_MASK_C0)

import/chips/p9/procedures/ppe_closed/sgpe/stop_gpe/p9_sgpe_stop_entry.c

@@ -908,10 +908,6 @@ p9_sgpe_stop_entry()
         PK_TRACE("Drop CME_INTERPPM_DPLL_ENABLE after DPLL is stopped via QPMMR[26]");
         GPE_PUTSCOM(GPE_SCOM_ADDR_QUAD(QPPM_QPMMR_CLR, qloop), BIT64(20) | BIT64(22) | BIT64(24) | BIT64(26));
 
-        /// @todo RTC166918 add VDM_ENABLE attribute control
-        PK_TRACE("Drop vdm enable via CPPM_VDMCR[0]");
-        GPE_PUTSCOM(GPE_SCOM_ADDR_QUAD(PPM_VDMCR_CLR, qloop), BIT64(0));
-
         PK_TRACE_INF("SE.11D: Cache Clock Stopped");
 
         PK_TRACE("Gate the PCBMux request so scanning doesn't cause random requests");