gpio/starfive: redundant readl() call

In starfive_gpio_direction_output() readl() is called twice to read the
gpio direction register. The result of the first read is discarded.

Remove the redundant read.

Fixes: 908be1b8

 ("gpio/starfive: add gpio driver and support gpio reset")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Anup Patel <anup@brainfault.org>