ks8851: fix to set gpio output mode

In cases where gpio is not in output mode
use gpio_direction_output() instead of
gpio_get_value() to set the output mode.

Change-Id: I8a6b8d59c067a1741cb626f7b2701b1e17d44add
Acked-by: Zakir Syed <zhossain@qti.qualcomm.com>
Signed-off-by: Vijay Navnath Kamble <vkambl@codeaurora.org>
Signed-off-by: Utkarsh Saxena <usaxena@codeaurora.org>