Fixed bug in bitfield8_t
Fixed bug in bitfield8_t

The bitfield8_t was missing the bit 4 field - added the same.

Change-Id: I4b5be334f0c0b604053c911ca8e9168e35b43875
Signed-off-by: Zahed Hossain <92e95cfda0478c60025769b483d66a9837535fd8@in.ibm.com>

openbmc/pldm,openbmc/pldm,openbmc/pldm