feature(uname): Implement -p & -i (#1649)

Just return 'unknown' for both

Closes: #1636

tests/by-util/test_uname.rs

@@ -16,6 +16,40 @@ fn test_uname_name() {
     assert!(result.success);
 }
 
+#[test]
+fn test_uname_processor() {
+    let (_, mut ucmd) = at_and_ucmd!();
+
+    let result = ucmd.arg("-p").run();
+    assert!(result.success);
+    assert_eq!(result.stdout.trim_end(), "unknown");
+}
+
+#[test]
+fn test_uname_hwplatform() {
+    let (_, mut ucmd) = at_and_ucmd!();
+
+    let result = ucmd.arg("-i").run();
+    assert!(result.success);
+    assert_eq!(result.stdout.trim_end(), "unknown");
+}
+
+#[test]
+fn test_uname_machine() {
+    let (_, mut ucmd) = at_and_ucmd!();
+
+    let result = ucmd.arg("-m").run();
+    assert!(result.success);
+}
+
+#[test]
+fn test_uname_kernel_version() {
+    let (_, mut ucmd) = at_and_ucmd!();
+
+    let result = ucmd.arg("-v").run();
+    assert!(result.success);
+}
+
 #[test]
 fn test_uname_kernel() {
     let (_, mut ucmd) = at_and_ucmd!();