gpio: altera: Fixup block comment style

Add missing '*' char to the start of the comment lines.

Signed-off-by: Phil Reid <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-altera.c

···
 * struct altera_gpio_chip
 * @mmchip		: memory mapped chip structure.
 * @gpio_lock		: synchronization lock so that new irq/set/get requests
-			  will be blocked until the current one completes.
+*			  will be blocked until the current one completes.
 * @interrupt_trigger	: specifies the hardware configured IRQ trigger type
-			  (rising, falling, both, high)
+*			  (rising, falling, both, high)
 * @mapped_irq		: kernel mapped irq number.
 */
 struct altera_gpio_chip {