CPU: minor changes in cpuid

kernel/src/arch/x86_64/cpuid.rs

@@ -145,7 +145,7 @@ impl VersionInformation {
     fn processor_signature(self) -> u32 {
         self.eax
     }
-
+    // TODO: Change return type and move this to a file that has the list
     pub fn brand_string(self) -> Option<&'static str> {
         let brand_index = bits_of(self.ebx, 0, 7);
         let processor_signature = self.processor_signature();