ALSA: sound/soc/pxa/tosa.c: removed duplicated include

Removed duplicated include <asm/arch/tosa.h> in
sound/soc/pxa/tosa.c.

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>