gpio: update stm32 gpio to support LL clock control driver

After introducing STM32Cube based clock control driver for
stm32 family, update GPIO driver to support it.
Once supported across the whole family, we clean up will be done.

Change-Id: If50cb580cb01dc1d38557e54f19a8260feaa504e
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
2 files changed