MAINTAINERS: defer vendor owned I3C drivers from generic area

I3C drivers from different vendors are best evaluated by
the vendor maintainers and collaborator since they are more
familiar with the hardward and are better equipped to evaluate
the code. So use defer-to-other-areas such that the reviewer
assignment script gives them higher priority.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

Author: dcpleung

MAINTAINERS.yml

@@ -2264,6 +2264,13 @@ Documentation Infrastructure:
     - include/zephyr/drivers/i3c/
     - doc/hardware/peripherals/i3c.rst
     - tests/drivers/build_all/i3c/
+  file-groups:
+    - name: I3C driver
+      defer-to-other-areas: true
+      files:
+        - drivers/i3c/i3c_*.c
+        - drivers/i3c/Kconfig.*
+        - dts/bindings/i3c/
   labels:
     - "area: I3C"
   tests: