Remove frameSampleCount from cores since OE can implement it better internally

BSNESGameCore.mm

@@ -330,11 +330,6 @@ static void writeSaveFile(const char* path, int type)
     return SIZESOUNDBUFFER;
 }
 
-- (NSUInteger)frameSampleCount
-{
-    return SAMPLEFRAME;
-}
-
 - (NSUInteger)frameSampleRate
 {
     return SAMPLERATE;