ASoC: jz4740-i2s: Remove unused 'mem' resource

This isn't used and doesn't need to be in the private data struct.
Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20220708160244.21933-3-aidanmacdonald.0x0@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/jz4740/jz4740-i2s.c

@@ -93,7 +93,6 @@ struct i2s_soc_info {
 };
 
 struct jz4740_i2s {
-	struct resource *mem;
 	void __iomem *base;
 
 	struct clk *clk_aic;