AVC: Added two decode error handlings. (#280)

* * rocDecode/AVC: Added two decode error handlings.
 - Exit with error when the stream is coded field pictures.
 - Exit with error when the stream has multiple slice groups. VCN HW does not support it.

* * rocDecode/AVC: Added a missing error return from the last commit.

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Co-authored-by: Aryan Salmanpour <aryan.salmanpour@amd.com>

[ROCm/rocdecode commit: 5c18444bcc]

projects/rocdecode/src/parser/avc_parser.h

@@ -172,9 +172,9 @@ protected:
     /*! \brief Function to parse Picture Parameter Set 
      * \param [in] p_stream A pointer of <tt>uint8_t</tt> for the input stream to be parsed
      * \param [in] size Size of the input stream
-     * \return No return value
+     * \return <tt>ParserResult</tt>
      */
-    void ParsePps(uint8_t *p_stream, size_t stream_size_in_byte);
+    ParserResult ParsePps(uint8_t *p_stream, size_t stream_size_in_byte);
 
     /*! \brief Function to parse slice header
      * \param p_stream The pointer to the input bit stream