Codec2Buffer: Update 64bit check in asC2Buffer

In case of devices which support both 64bit and 32bit builds,
GraphicMetadataBuffer will return an error in 64bit builds only if
debug.stagefright.c2inputsurface is set to 0.

Bug: 178228919
Test: atest CtsMediaV2TestCases

Change-Id: I98a96bad02930947bee40e09ae4d42e684981421