drivers: adc: stm32: do not disable adc after measurement

Do not disable the ADC after the end of the measurement to avoid systematic
enabling which is time-consuming in case the configuration is unchanged.

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
(cherry picked from commit 62f11055501854a633847f8b413f9cf5b61aad79)
1 file changed