CVE-2025-71228 LoongArch: Set correct protection_map[] for VM_NONE/VM_SHARED

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Set correct protectionmap for VMNONE/VMSHARED For 32BIT platform PAGEPROTNONE is 0, so set a VMA to be VMNONE or VMSHARED will make pages non-present, then cause Oops with kernel page fault. Fix it by set correct...