counter: Don't use "proxy" headers

Update header inclusions to follow IWYU (Include What You Use)
principle.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240422144850.2031076-1-andriy.shevchenko@linux.intel.com
Signed-off-by: William Breathitt Gray <wbg@kernel.org>

include/linux/counter.h

@@ -6,14 +6,15 @@
 #ifndef _COUNTER_H_
 #define _COUNTER_H_
 
+#include <linux/array_size.h>
 #include <linux/cdev.h>
 #include <linux/device.h>
-#include <linux/kernel.h>
 #include <linux/kfifo.h>
 #include <linux/mutex.h>
 #include <linux/spinlock_types.h>
 #include <linux/types.h>
 #include <linux/wait.h>
+
 #include <uapi/linux/counter.h>
 
 struct counter_device;