Input: cros_ec_keyb - remove an unused field in struct cros_ec_keyb

In "struct cros_ec_keyb", the 'keymap_data' field is unused.
Remove it.

Found with cppcheck, unusedStructMember.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/6bab1449c01c4537aa2d9cb4481e1d5da8aa2389.1714546173.git.christophe.jaillet@wanadoo.frSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/cros_ec_keyb.c

@@ -35,7 +35,6 @@
  * @rows: Number of rows in the keypad
  * @cols: Number of columns in the keypad
  * @row_shift: log2 or number of rows, rounded up
- * @keymap_data: Matrix keymap data used to convert to keyscan values
  * @ghost_filter: true to enable the matrix key-ghosting filter
  * @valid_keys: bitmap of existing keys for each matrix column
  * @old_kb_state: bitmap of keys pressed last scan
@@ -50,7 +49,6 @@ struct cros_ec_keyb {
 	unsigned int rows;
 	unsigned int cols;
 	int row_shift;
-	const struct matrix_keymap_data *keymap_data;
 	bool ghost_filter;
 	uint8_t *valid_keys;
 	uint8_t *old_kb_state;