print build-CPU info on boot

kernel/src/main.zig

@@ -34,6 +34,8 @@ const c = @cImport({
 export fn zigmain() void {
     // // const message: [*:0]const u8 = "hello, zig!\n";
     std.log.info("All your codebase are belong to us.", .{});
+
+    std.log.debug("CPU info: {}", .{builtin.cpu});
     c.puts("zig ee\n");
 
     kalloc.kallocNop();