Bluetooth: Remove gpio_direction_input call for bt_gpio_sw_ctrl

bt_gpio_sw_ctrl is configured input by pmic by default.
For some platform such as jr510, gpio_direction_input would
lead to wdog error as REGISTER read only permission is just given.

Change-Id: Ie446f2ec9aa7539acf67d88e9635dc9d3d65595a
Signed-off-by: xiaowang <xiaowang@codeaurora.org>