ASoC: atmel: fix shadowed variable

Fix cppcheck warning:

sound/soc/atmel/atmel-classd.c:51:14: style: Local variable 'pwm_type'
shadows outer variable [shadowVariable]
 const char *pwm_type;
             ^
sound/soc/atmel/atmel-classd.c:226:27: note: Shadowed declaration
static const char * const pwm_type[] = {
                          ^
sound/soc/atmel/atmel-classd.c:51:14: note: Shadow variable
 const char *pwm_type;
             ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Link: https://lore.kernel.org/r/20210326215927.936377-3-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>