Modify BMC busy flag mailbox register value

BMC busy period is the time for which BMC is busy (e.g. Flashing).
PFR-Manager should not send the security packets to BMC during that
interval. This commit corrects the BMC Busy Mailbox register value
to 0x80 as per the PFR HAS.

Tested:
Before update :
root@bmc-maca4bf018ce3a0:~#
 busctl call xyz.openbmc_project.PFR.Manager
/xyz/openbmc_project/pfr xyz.openbmc_project.PFR.Mailbox
ReadMBRegister u 0x63
y 0

After update :
root@bmc-maca4bf018ce3a0:~#
busctl call xyz.openbmc_project.PFR.Manager
/xyz/openbmc_project/pfr xyz.openbmc_project.PFR.Mailbox
ReadMBRegister u 0x63
y 0x80

Change-Id: I633a2d34dd889465309f7417f4e0e7c892d8d174
Signed-off-by: Alex Antony <alexx.kanjirathingal.antony@intel.com>
Signed-off-by: Jayaprakash Mutyala <mutyalax.jayaprakash@intel.com>
1 file changed