Do not start polling KCS status register until MCTP bus is intitialized
Do not start polling KCS status register until MCTP bus is intitialized

There is a bug that leaves us exposed to a potential program crash. We
start polling the status reg before the bus is initialized. If we happen
to see a MCTP message during this time we will attempt to handle it and
will assert because the bus is not set up yet.

Change-Id: Ib5b21ad56f5b8bd8bbaa9956501bb3e6ca1dd321
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/99535
Reviewed-by: Christian R Geddes <f397583a9caa8163a06ad1128784fb67413f2fe6@us.ibm.com>
Reviewed-by: Zachary Clark <9de8c4480303b5335cd2a33eefe814615ba3612a@ibm.com>
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Tested-by: Jenkins OP Build CI <e610bd72261d3c0a48f1e8ae36832ab00774d426@us.ibm.com>
Tested-by: FSP CI Jenkins <aa9e4d9ac7cd25905e9c0dd36d4150516e73dd86@us.ibm.com>
Tested-by: Jenkins Combined Simics CI <8312af3886dfc9bb930f549023677220805b137e@us.ibm.com>
Reviewed-by: Ilya Smirnov <2c7a6ec38cfb553b896499595cca9c656159f2a4@us.ibm.com>
Reviewed-by: William G Hoffa <7dd6aa5e78423995d9d7c7ecada5b77ee07f88cc@us.ibm.com>

open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot