MAINTAINERS: add @josuah as collaborator for BFLB platform

Add myself as collaborator to help with reviews and occasional
contributions for the Bouffalo Labs SoC peripherals, configurations,
and HAL.

Signed-off-by: Josuah Demangeon <[email protected]>

Author: josuah

MAINTAINERS.yml

@@ -692,6 +692,8 @@ Bouffalolab Platforms:
   status: maintained
   maintainers:
     - VynDragon
+  collaborators:
+    - josuah
   files:
     - boards/bflb/
     - drivers/*/*bflb*
@@ -5297,6 +5299,8 @@ West:
   status: maintained
   maintainers:
     - VynDragon
+  collaborators:
+    - josuah
   files:
     - modules/hal_bouffalolab/
   labels: