drivers/rtc/rtc-v3020.c: use gpio_request_array()

drivers/rtc/rtc-v3020.c: use gpio_request_array()

Using gpio_request_array()/gpio_free_array() can make the code simpler
because it can set the direction and initial value in one shot and the for
loop is unnecessary.

Also, struct v3020_gpio is removed, because the struct v3020_gpio is
replaced with struct gpio.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>