Add build preset full_no_platform

Add build preset as above, and utilise it in
all.sh:component_test_no_platform.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>

scripts/config.py

@@ -358,6 +358,22 @@ def no_deprecated_adapter(adapter):
         return adapter(name, active, section)
     return continuation
 
+def no_platform_adapter(adapter):
+    """Modify an adapter to disable platform symbols.
+
+    ``no_platform_adapter(adapter)(name, active, section)`` is like
+    ``adapter(name, active, section)``, but unsets all platform symbols other
+    ``than MBEDTLS_PLATFORM_C.
+    """
+    def continuation(name, active, section):
+        # Allow MBEDTLS_PLATFORM_C but remove all other platform symbols.
+        if name.startswith('MBEDTLS_PLATFORM_') and name != 'MBEDTLS_PLATFORM_C':
+            return False
+        if adapter is None:
+            return active
+        return adapter(name, active, section)
+    return continuation
+
 class ConfigFile(Config):
     """Representation of the Mbed TLS configuration read for a file.
 
@@ -540,6 +556,10 @@ if __name__ == '__main__':
                     """Uncomment most non-deprecated features.
                     Like "full", but without deprecated features.
                     """)
+        add_adapter('full_no_platform', no_platform_adapter(full_adapter),
+                    """Uncomment most non-platform features.
+                    Like "full", but without platform features.
+                    """)
         add_adapter('realfull', realfull_adapter,
                     """Uncomment all boolean #defines.
                     Suitable for generating documentation, but not for building.""")