regmap: soundwire: remove unused header mod_devicetable.h

mod_devicetable.h does not seem to be required for this file, so
remove it.
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20200829103939.4007097-1-vkoul@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regmap-sdw.c

@@ -2,7 +2,6 @@
 // Copyright(c) 2015-17 Intel Corporation.
 
 #include <linux/device.h>
-#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/soundwire/sdw.h>
 #include "internal.h"