ASoC: imx-audmux: Silence a clang warning

Change the of_device_get_match_data() cast to (uintptr_t)
to silence the following clang warning:

sound/soc/fsl/imx-audmux.c:301:16: warning: cast to smaller integer type 'enum imx_audmux_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 6a8b8b58 ("ASoC: imx-audmux: Remove unused .id_table")
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20220526010543.1164793-1-festevam@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/imx-audmux.c

@@ -298,7 +298,7 @@ static int imx_audmux_probe(struct platform_device *pdev)
 		audmux_clk = NULL;
 	}
 
-	audmux_type = (enum imx_audmux_type)of_device_get_match_data(&pdev->dev);
+	audmux_type = (uintptr_t)of_device_get_match_data(&pdev->dev);
 
 	switch (audmux_type) {
 	case IMX31_AUDMUX: