Replaces nvdimmWrite() to reset controller with nvdimmResetController()

nvdimmResetController() will call nvdimm_encrypt_unlock() to unlock
encryption if needed. Without it nvdimm ops could fail on runtime

Change-Id: Iad4c4d354d3b9522ee0544b5c8de7484dcf89c6c
CQ:SW474050
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/82838
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Matt Derksen <mderkse1@us.ibm.com>
Reviewed-by: Daniel M Crowell <dcrowell@us.ibm.com>

src/usr/isteps/nvdimm/bpm_update.C

@@ -3489,9 +3489,9 @@ errlHndl_t Bpm::runFirmwareUpdates(BpmFirmwareLidImage i_image)
         handleMultipleErrors(errl, exitErrl);
     }
 
-    exitErrl = nvdimmWriteReg(iv_nvdimm,
-                              NVDIMM_MGT_CMD0,
-                              0x01);
+    // Reset controller and unlock encryption if necessary
+    exitErrl = nvdimmResetController(iv_nvdimm);
+
     if (exitErrl != nullptr)
     {
         TRACFCOMP(g_trac_bpm, ERR_MRK"Bpm::runFirmwareUpdates() "