Remove IO default memory block from 6502 pspec
Remove IO default memory block from 6502 pspec

- Corrects the length of the zero page and stack memory blocks.

NationalSecurityAgency/ghidra,NationalSecurityAgency/ghidra,NationalSecurityAgency/ghidra,NationalSecurityAgency/ghidra,NationalSecurityAgency/ghidra,NationalSecurityAgency/ghidra,NationalSecurityAgency/ghidra