Kernel: Rename OSPKU CPUID feature flag to OSPKE

Unlike "XSAVE enabled by OS" being indicated by the OSXSAVE flag, in
this case it's "PKU enabled by OS" being indicated by the OSPKE flag.

Kernel/Arch/x86/CPUID.h

@@ -142,7 +142,7 @@ AK_MAKE_ARBITRARY_SIZED_ENUM(CPUFeature, u256,
     AVX512_VBMI = CPUFeature(1u) << 97u,              // AVX-512 Vector Bit Manipulation Instructions
     UMIP = CPUFeature(1u) << 98u,                     // UMIP
     PKU = CPUFeature(1u) << 99u,                      // Memory Protection Keys for User-mode pages
-    OSPKU = CPUFeature(1u) << 100u,                   // PKU enabled by OS
+    OSPKE = CPUFeature(1u) << 100u,                   // PKU enabled by OS
     WAITPKG = CPUFeature(1u) << 101u,                 // Timed pause and user-level monitor/wait
     AVX512_VBMI2 = CPUFeature(1u) << 102u,            // AVX-512 Vector Bit Manipulation Instructions 2
     CET_SS = CPUFeature(1u) << 103u,                  // Control Flow Enforcement (CET) Shadow Stack

Kernel/Arch/x86/common/CPUID.cpp

@@ -206,8 +206,8 @@ StringView cpu_feature_to_string_view(CPUFeature::Type const& feature)
         return "umip"sv;
     if (feature == CPUFeature::PKU)
         return "pku"sv;
-    if (feature == CPUFeature::OSPKU)
-        return "ospku"sv;
+    if (feature == CPUFeature::OSPKE)
+        return "ospke"sv;
     if (feature == CPUFeature::WAITPKG)
         return "waitpkg"sv;
     if (feature == CPUFeature::AVX512_VBMI2)

Kernel/Arch/x86/common/Processor.cpp

@@ -287,7 +287,7 @@ UNMAP_AFTER_INIT void Processor::cpu_detect()
     if (extended_features.ecx() & (1 << 3))
         m_features |= CPUFeature::PKU;
     if (extended_features.ecx() & (1 << 4))
-        m_features |= CPUFeature::OSPKU;
+        m_features |= CPUFeature::OSPKE;
     if (extended_features.ecx() & (1 << 5))
         m_features |= CPUFeature::WAITPKG;
     if (extended_features.ecx() & (1 << 6))