arch: arm: stm32f1: Shift GPIO pin configuration values only once
arch: arm: stm32f1: Shift GPIO pin configuration values only once

In the stm32_gpio_flags_to_conf function the configuration
values of the GPIO pin are shifted two times. One in the
stm32-pinctrlf1 header and one in the function. This patch
removes one of those shifts.

Signed-off-by: Yannis Damigos <bda985a2727ac24c41652a294292988d6fc7dc73@gmail.com>

rsalveti/zephyr,rsalveti/zephyr,Vudentz/zephyr,fbsder/zephyr,aceofall/zephyr-iotos,zephyrproject-rtos/zephyr,fbsder/zephyr,punitvara/zephyr,finikorg/zephyr,zephyriot/zephyr,ldts/zephyr,rsalveti/zephyr,finikorg/zephyr,ldts/zephyr,rsalveti/zephyr,GiulianoFranchetto/zephyr,runchip/zephyr-cc3220,Vudentz/zephyr,aceofall/zephyr-iotos,runchip/zephyr-cc3220,zephyriot/zephyr,GiulianoFranchetto/zephyr,runchip/zephyr-cc3220,kraj/zephyr,aceofall/zephyr-iotos,nashif/zephyr,finikorg/zephyr,nashif/zephyr,runchip/zephyr-cc3220,galak/zephyr,aceofall/zephyr-iotos,fbsder/zephyr,punitvara/zephyr,Vudentz/zephyr,zephyriot/zephyr,explora26/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,Vudentz/zephyr,punitvara/zephyr,punitvara/zephyr,finikorg/zephyr,kraj/zephyr,galak/zephyr,ldts/zephyr,galak/zephyr,Vudentz/zephyr,nashif/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,mbolivar/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,rsalveti/zephyr,nashif/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,fbsder/zephyr,runchip/zephyr-cc3220,mbolivar/zephyr,aceofall/zephyr-iotos,fbsder/zephyr,mbolivar/zephyr,mbolivar/zephyr,zephyriot/zephyr,finikorg/zephyr,kraj/zephyr,mbolivar/zephyr,kraj/zephyr,kraj/zephyr,ldts/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyriot/zephyr