Use the global default cpp_std.

Bug: http://b/344590580
Change-Id: I523e556f77e33fbaa6711b9ada7c8646202a2749
diff --git a/media/codec2/components/hevc/C2SoftHevcDec.h b/media/codec2/components/hevc/C2SoftHevcDec.h
index 6abf69e..ff6d371 100644
--- a/media/codec2/components/hevc/C2SoftHevcDec.h
+++ b/media/codec2/components/hevc/C2SoftHevcDec.h
@@ -132,7 +132,7 @@
         VuiColorAspects()
             : primaries(2), transfer(2), coeffs(2), fullRange(0) { }
 
-        bool operator==(const VuiColorAspects &o) {
+        bool operator==(const VuiColorAspects &o) const {
             return primaries == o.primaries && transfer == o.transfer && coeffs == o.coeffs
                     && fullRange == o.fullRange;
         }