cosmetics: normalize include guards

use the recommended format [1] of:
<PROJECT>_<PATH>_<FILE>_H_

[1] https://google.github.io/styleguide/cppguide.html#The__define_Guard
"All header files should have #define guards to prevent multiple
inclusion. The format of the symbol name should be
<PROJECT>_<PATH>_<FILE>_H_."

Change-Id: I00a0595fc2a5fc736ab6ff3215727d6db05b10e1
diff --git a/av1/decoder/inspection.h b/av1/decoder/inspection.h
index bb604f6..7214a9b 100644
--- a/av1/decoder/inspection.h
+++ b/av1/decoder/inspection.h
@@ -8,8 +8,8 @@
  * Media Patent License 1.0 was not distributed with this source code in the
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */
-#ifndef AOM_INSPECTION_H_
-#define AOM_INSPECTION_H_
+#ifndef AOM_AV1_DECODER_INSPECTION_H_
+#define AOM_AV1_DECODER_INSPECTION_H_
 
 #ifdef __cplusplus
 extern "C" {
@@ -81,4 +81,4 @@
 #ifdef __cplusplus
 }  // extern "C"
 #endif  // __cplusplus
-#endif  // AOM_INSPECTION_H_
+#endif  // AOM_AV1_DECODER_INSPECTION_H_