frameworks/rs: fix typos and clang-tidy warnings

This change fixes a few typos and clang tidy warnings related to the
"llvm-namespace-comment" checks.

Bug: 26936282
Test: WITH_TIDY=1 WITH_TIDY_CHECKS="llvm-namespace-comment" mm
Change-Id: Ic65182e5b4999fbd48d6a8ad7172e4bfeeb541f4
diff --git a/cpu_ref/rsCpuScript.h b/cpu_ref/rsCpuScript.h
index d6d100c..c6f9624 100644
--- a/cpu_ref/rsCpuScript.h
+++ b/cpu_ref/rsCpuScript.h
@@ -28,7 +28,7 @@
 
 namespace bcinfo {
     class MetadataExtractor;
-}
+} // namespace bcinfo
 
 namespace android {
 namespace renderscript {
@@ -151,7 +151,7 @@
                                 const char *commandLine,
                                 const char ** bccFiles, size_t numFiles);
 
-}
+} // namespace renderscript
 
 #ifdef __LP64__
 #define SYSLIBPATH "/system/lib64"
@@ -167,6 +167,6 @@
 #define SYSLIBPATH_VENDOR "/system/vendor/lib"
 #endif
 
-}
+} // namespace android
 
 #endif  // RSD_CPU_SCRIPT_H