mkv: fix incompatible-pointer-types between Mkv_generatePcmCodecPrivateData and AudioTrackInfo_t.uCodecPrivateLen

[codingspirit]

Mkv_generatePcmCodecPrivateData is taking size_t* but AudioTrackInfo_t.uCodecPrivateLen is uint32_t, which will cause following build warning in newer gcc:

warning: passing argument 5 of 'Mkv_generatePcmCodecPrivateData' from incompatible pointer type [-Wincompatible-pointer-types]
  353 |         Mkv_generatePcmCodecPrivateData(AUDIO_CODEC_OBJECT_TYPE, audioTrackInfo.uFrequency, audioTrackInfo.uChannelNumber, &audioTrackInfo.pCodecPrivate, &audioTrackInfo.uCodecPrivateLen);
      |                                                                                                                                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                                                                                                                                           |
      |                                                                                                                                                           uint32_t * {aka unsigned int *}

Signed-off-by: zhiqinli@amazon.com zhiqinli@amazon.com

Issue #, if available:

Description of changes:

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