This patch prepares for supporting the STM32 variant that
has no such bit in the status register.
Signed-off-by: NAndrea Merello <andrea.merello@gmail.com>
Signed-off-by: NPatrice Chotard <patrice.chotard@st.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>