Include all submodules for readthedocs

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 2b10f86..bc0701e 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -5,10 +5,10 @@
 # Required
 version: 2
 
-# Include the framework submodule in the build
+# Include all submodules in the build
 submodules:
-  include:
-  - framework
+  include: all
+  recursive: true
 
 # Set the version of Python and other tools you might need
 build: