MAINTAINERS: add the Enclustra Platforms area of maintenance

This commit adds the `Enclustra Platforms` area of maintenance, and assigns
a maintainer and a collaborator to it.

Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com>

MAINTAINERS.yml

@@ -4128,6 +4128,17 @@ STM32 Wireless Platforms:
     STM32WB SOCs, dts files and related drivers. STM32WB development boards
     and ST bluetooth shields.
 
+Enclustra Platforms:
+  status: maintained
+  maintainers:
+    - fkokosinski
+  collaborators:
+    - tgorochowik
+  files:
+    - boards/enclustra/
+  labels:
+    - "platform: Enclustra"
+
 Espressif Platforms:
   status: maintained
   maintainers: