drivers: serial: stm32: Add wakeup capability support

Add wakeup capability support.
wip comment

(cherry picked from commit 4422de5692bec134ca0269ad54c4b3aace1c8188)

Original-Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
GitOrigin-RevId: 4422de5692bec134ca0269ad54c4b3aace1c8188
Change-Id: I7b6ed1f8d82321a0ebd168df0fe4a609852ec673
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/3829401
Tested-by: CopyBot Service Account <copybot.service@gmail.com>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
1 file changed