lav*,tests: remove several register_all calls

avdevice_register_all() is still required to register devices into
lavf (this is required due to lavd being somewhat of a hack).

Signed-off-by: Josh de Kock <josh@itanimul.li>

tests/api/api-codec-param-test.c

@@ -231,8 +231,6 @@ int main(int argc, char* argv[])
     AVFormatContext *fmt_ctx = NULL;
     AVFormatContext *fmt_ctx_no_decode = NULL;
 
-    av_register_all();
-
     if (argc < 2) {
         av_log(NULL, AV_LOG_ERROR, "Usage: %s <input>\n", argv[0]);
         return -1;