CODEOWNERS: remove specific entries for conf and recipes-kernel

Use the main codeowners list for most of the repository until we have a
larger set of recipes and responsibilities.

Signed-off-by: Ricardo Salveti <[email protected]>

Author: ricardosalveti

.github/CODEOWNERS

@@ -4,9 +4,3 @@
 
 # Reviewers to be assigned for any changes in ci/ subdirectory
 ci/*  @quaresmajose @ricardosalveti @sbanerjee-quic @ndechesne
-
-# Reviewers to be assigned for any changes in conf/ subdirectory
-conf/*  @vkraleti @ricardosalveti @sbanerjee-quic @ndechesne
-
-# Reviewers to be assigned for any changes in recipes-kernel/linux/ subdirectory
-recipes-kernel/linux/*  @NainaMehtaQUIC @vkraleti @sbanerjee-quic @ndechesne