ASoC: Intel: sof_sdw: make sof_sdw_quirk static

There's no need to make this variable visible at a higher level.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://patch.msgid.link/20240827123215.258859-2-yung-chuan.liao@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_sdw.c

@@ -17,7 +17,7 @@
 #include "sof_sdw_common.h"
 #include "../../codecs/rt711.h"
 
-unsigned long sof_sdw_quirk = RT711_JD1;
+static unsigned long sof_sdw_quirk = RT711_JD1;
 static int quirk_override = -1;
 module_param_named(quirk, quirk_override, int, 0444);
 MODULE_PARM_DESC(quirk, "Board-specific quirk override");

sound/soc/intel/boards/sof_sdw_common.h

@@ -58,8 +58,6 @@ struct intel_mc_ctx {
 	unsigned int sdw_pin_index[SDW_INTEL_MAX_LINKS];
 };
 
-extern unsigned long sof_sdw_quirk;
-
 /* generic HDMI support */
 int sof_sdw_hdmi_init(struct snd_soc_pcm_runtime *rtd);