Add stub implementations of non-protected nVHE stack unwinder, for
building. These are implemented later in this series.
Signed-off-by: NKalesh Singh <kaleshsingh@google.com>
Reviewed-by: NFuad Tabba <tabba@google.com>
Tested-by: NFuad Tabba <tabba@google.com>
Signed-off-by: NMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220726073750.3219117-9-kaleshsingh@google.com