OEM-IBM:Remove misleading trace in case of BMC reboot

In case of BMC reboot state manager starts after pldm,
so while sending bios attribute update event it doesn't get
boot progress state and causes exception. This is not considered
as error and pldm sends attribute update events to host.
So removed the trace.

Change-Id: Id00815d6b224783941cfebb1a92bb852cf101e48
Signed-off-by: ArchanaKakani <archana.kakani@ibm.com>