Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for reference

For this round, the fixes are only applied to the following to minimize breaking dependencies:
  * comments (excluding javaDoc annotations)
	* private constants
	* private functions
	* parameters within functions

BYPASS_INCLUSIVE_LANGUAGE_REASON=Just updating a few select inclusive language violations.
No-Typo-Check: Changes focused on inclusive language violations.
BUG: 295342157

Change-Id: Icec32a6672f514156401230df37cc425525edd87

tests/libs-permissions/system_ext/java/com/android/test/libs/system_ext/LibsSystemExtTest.java

@@ -22,7 +22,7 @@ package com.android.test.libs.system_ext;
 public class LibsSystemExtTest {
 
     /**
-     * Dummy method for testing.
+     * Placeholder method for testing.
      */
     public static void test() {
     }