Update language to comply with Android's inclusive language guidance

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

Bug: 161896447
Change-Id: I89a5e704c48d47dc83bdcae0b136d994874a90b4
diff --git a/cpu_ref/rsCpuScript.cpp b/cpu_ref/rsCpuScript.cpp
index e41a6b8..a495246 100644
--- a/cpu_ref/rsCpuScript.cpp
+++ b/cpu_ref/rsCpuScript.cpp
@@ -357,7 +357,7 @@
         }
     }
     else {
-        // add a dummy/constant as a checksum if verification is disabled
+        // add a placeholder/constant as a checksum if verification is disabled
         mBuildChecksum = 0xabadcafe;
     }