Revert "Setting phal ipl_init as IPL_DEFAULT to boot the system"

Mode value is incorrect, it should IPL_BOOT.

This reverts commit 22de8ac1049d3e3fac3e52a6a88611adc8250666.

Change-Id: I7859834580cf40094077645e539d18029ae08bcc
diff --git a/procedures/phal/start_host.cpp b/procedures/phal/start_host.cpp
index 299b3fb..a5e7bea 100644
--- a/procedures/phal/start_host.cpp
+++ b/procedures/phal/start_host.cpp
@@ -22,7 +22,7 @@
     openpower::pel::addBootErrorCallbacks();
 
     // callback method will be called upon failure which will create the PEL
-    if (ipl_init(IPL_DEFAULT) != 0)
+    if (ipl_init() != 0)
     {
         log<level::ERR>("ipl_init failed");
         throw std::runtime_error("Boot initialization failed");