Fix Stack-use-after-scope error in C2Fuzzer

In C2Fuzzer, configuration parameters C2StreamPictureSizeInfo::input,
C2StreamSampleRateInfo::output and C2StreamChannelCountInfo::output
were declared as stack variables which lead to the errors. These
are now declared on heap and freed later

Bug: 191341806
Test: Tested with ASAN:
      Stack-use-after-scope error without the fix and
      no errors reported with fix

Change-Id: Ic6d981668143d253e2ef52f5c273fc754d602db0