iio: proximity: cros_ec_mkbp_proximity: Switch to including mod_devicetable.h for struct of_device_id definition

of.h was only included for this definition, so include the correct header
instead.

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://patch.msgid.link/20240823220718.743596-1-andy.shevchenko@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Author: andy-shev

drivers/iio/proximity/cros_ec_mkbp_proximity.c

@@ -6,10 +6,10 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/notifier.h>
-#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/types.h>