ASoC: ux500: mop500: rename shadowing variable

ASoC: ux500: mop500: rename shadowing variable

cppcheck warning:

sound/soc/ux500/mop500.c:143:23: style: Local variable 'mop500_card'
shadows outer variable [shadowVariable]

 struct snd_soc_card *mop500_card = platform_get_drvdata(pdev);
                      ^
sound/soc/ux500/mop500.c:54:28: note: Shadowed declaration
static struct snd_soc_card mop500_card = {
                           ^
sound/soc/ux500/mop500.c:143:23: note: Shadow variable
 struct snd_soc_card *mop500_card = platform_get_drvdata(pdev);
                      ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210326215927.936377-17-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>