Applications: Use new global variables at /sys/kernel/ directory

Author: https://github.com/supercomputer7
Commit: 5dfb2b18f3
Pull-request: https://github.com/SerenityOS/serenity/pull/15593
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Applications/SystemMonitor/ProcessModel.cpp

@@ -31,7 +31,7 @@ ProcessModel::ProcessModel()
     VERIFY(!s_the);
     s_the = this;
 
-    auto file = Core::File::construct("/proc/cpuinfo");
+    auto file = Core::File::construct("/sys/kernel/cpuinfo");
     if (file->open(Core::OpenMode::ReadOnly)) {
         auto buffer = file->read_all();
         auto json = JsonValue::from_string({ buffer });