ARM: 7903/1: sa1100: h3xxx: drop hand-coded gpio_request_array analogue

h3xxx_init_gpio() behaves alsmost like gpio_request_array. Also after
all GPIO refactoring it is unused. Drop it now.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>