MAINTAINERS: Add avolmat-st as collaborator in Drivers: Video

Adding Alain Volmat (avolmat-st) as collaborator in Drivers: Video

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>

Author: erwango

MAINTAINERS.yml

@@ -2163,6 +2163,7 @@ Release Notes:
     - loicpoulain
     - josuah
     - ngphibang
+    - avolmat-st
   files:
     - drivers/video/
     - include/zephyr/drivers/video.h