Input: nomadik-ske-keypad - fix a trivial typo

s/regsiter/register/
Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/nomadik-ske-keypad.c

@@ -54,7 +54,7 @@
 /**
  * struct ske_keypad  - data structure used by keypad driver
  * @irq:	irq no
- * @reg_base:	ske regsiters base address
+ * @reg_base:	ske registers base address
  * @input:	pointer to input device object
  * @board:	keypad platform device
  * @keymap:	matrix scan code table for keycodes