Input: st-keyscan - add missing linux/input.h and linux/of.h includes

We are going to clean up matrix_keymap.h from unnecessary includes,
so the driver needs to include API that it uses directly.

Also let's sort includes alphabetically.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220923194738.927408-2-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/st-keyscan.c

@@ -8,12 +8,14 @@
  * Based on sh_keysc.c, copyright 2008 Magnus Damm
  */
 
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
 #include <linux/clk.h>
-#include <linux/io.h>
+#include <linux/input.h>
 #include <linux/input/matrix_keypad.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
 
 #define ST_KEYSCAN_MAXKEYS 16