MAINTAINERS: Add babrsn to Bluetooth Audio

I have contributed the following PRs:
#80000
#79360
#78846
#78751
#74950
#74946
#73845
#72849

and am attending the weekly LE Audio Zephyr meetings.

Signed-off-by: Babak Arisian <[email protected]>

Author: babrsn

MAINTAINERS.yml

@@ -463,6 +463,7 @@ Bluetooth Audio:
     - pin-zephyr
     - niym-ot
     - jthm-ot
+    - babrsn
   files:
     - subsys/bluetooth/audio/
     - include/zephyr/bluetooth/audio/