Secure Boot: Detach secure PNOR provider task

Once secure PNOR provider task starts, immediately detach it so that, should
it die, Hostboot will terminate; otherwise, Hostboot can hang until terminated
by a service processor boot timeout.

Change-Id: I586db0bb56e7e1eedb1183cda34e4bda4bc03bbd
CQ: SW419735
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/55048
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: ILYA SMIRNOV <ismirno@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Michael Baiocchi <mbaiocch@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/usr/pnor/spnorrp.C

@@ -40,6 +40,7 @@
 #include <secureboot/containerheader.H>
 #include <secureboot/trustedbootif.H>
 #include <secureboot/header.H>
+#include <sys/task.h>
 
 extern trace_desc_t* g_trac_pnor;
 
@@ -72,6 +73,9 @@ using namespace PNOR;
  */
 void* secure_wait_for_message( void* unused )
 {
+    // Mark task as an independent daemon so if it crashes, Hostboot will
+    // terminate
+    (void)task_detach();
     TRACUCOMP(g_trac_pnor, "wait_for_message> " );
     Singleton<SPnorRP>::instance().waitForMessage();
     return NULL;