C2SoftOpusEnc: Fix integer overflows leading to crash by changing data type

Bug: 211910627

Test: POC in bug descriptions
Test: atest VtsHalMediaC2V1_0TargetAudioEncTest
Test: atest CtsMediaTestCases:EncoderTest

Change-Id: I72fee83ae27d3f446b1584fd4fd047e93a0a01d9
diff --git a/media/codec2/components/opus/C2SoftOpusEnc.h b/media/codec2/components/opus/C2SoftOpusEnc.h
index 2b4d8f2..733a6bc 100644
--- a/media/codec2/components/opus/C2SoftOpusEnc.h
+++ b/media/codec2/components/opus/C2SoftOpusEnc.h
@@ -67,7 +67,7 @@
     uint32_t mSampleRate;
     uint32_t mChannelCount;
     uint32_t mFrameDurationMs;
-    uint64_t mAnchorTimeStamp;
+    int64_t mAnchorTimeStamp;
     uint64_t mProcessedSamples;
     // Codec delay in ns
     uint64_t mCodecDelay;