Fix an off-by-bit error in the AGP_MODE_[GS]ET_RATE() macros.
Fix an off-by-bit error in the AGP_MODE_[GS]ET_RATE() macros.

PR:		32140
Submitted by:	Mark McCleary <mark.mccleary@windriver.com>
MFC after:	3 days

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase