remove dma clear test, it only makes a 10% difference
remove dma clear test, it only makes a 10% difference

jeelabs/embello,smurfix/embello,jeelabs/embello,jeelabs/embello,tve/embello,smurfix/embello,jeelabs/embello,tve/embello,smurfix/embello,jeelabs/embello,tve/embello