remove kernel_cap_struct requirement

Author: Valentin Obst

volatility3/framework/symbols/linux/__init__.py

@@ -29,7 +29,6 @@ def __init__(self, *args, **kwargs) -> None:
         self.set_type_class("files_struct", extensions.files_struct)
         self.set_type_class("kobject", extensions.kobject)
         self.set_type_class("cred", extensions.cred)
-        self.set_type_class("kernel_cap_struct", extensions.kernel_cap_struct)
         # Might not exist in the current symbols
         self.optional_set_type_class("module", extensions.module)
         self.optional_set_type_class("bpf_prog", extensions.bpf_prog)