Fix BIOS default geometry on pc98.
Fix BIOS default geometry on pc98.

PR:		kern/72225
Submitted by:	Hirokazu WATANABE <wnabe@par.odn.ne.jp>

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