Remove duplicate GVA-to-GPA translation in sw breakpoint functions

[IrvingMg]

Fix double GVA-to-GPA translation in add_sw_breakpoint and remove_sw_breakpoint. These functions were translating addresses before passing them to read_addrs/write_addrs, which translate internally.

Fixes #1046

[jsturtevant]

Thanks @IrvingMg! this look good on a quick glance. Might have @dblnz take a look. Given holidays might be slow.

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