MAINTAINERS: remove anangl as ADC and PWM maintainer

I won't be able to act as a maintainer in these areas.
Degrade my role to collaborator.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>

Author: anangl

MAINTAINERS.yml

@@ -1086,8 +1086,8 @@ Release Notes:
     - "Release Notes"
 
 "Drivers: ADC":
-  status: maintained
-  maintainers:
+  status: odd fixes
+  collaborators:
     - anangl
   files:
     - drivers/adc/
@@ -2037,10 +2037,9 @@ Release Notes:
     - "area: PM CPU ops"
 
 "Drivers: PWM":
-  status: maintained
-  maintainers:
-    - anangl
+  status: odd fixes
   collaborators:
+    - anangl
     - henrikbrixandersen
   files:
     - drivers/pwm/