sys_vm: Fix sys_vm_invalidate #6281
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Do not zero-out contents of targeted memory.
Heres the testcase https://github.com/elad335/myps3tests/blob/master/ppu_tests/sys_vm_invalidate/ppumain.cpp.
Testing contents of sys_vm memory after first run, after a second sys_vm_touch and after sys_vm_invalidate by reading 4 bytes from different places.
Results: sys_vm_invalidate does not clear memory contents.