docs: remove unused SPM related diagrams

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: Ia60c4aa6a0aa0da5765d295e658964e6faa5960a
diff --git a/docs/resources/diagrams/ffa-ns-interrupt-handling-managed-exit.png b/docs/resources/diagrams/ffa-ns-interrupt-handling-managed-exit.png
deleted file mode 100644
index 0619cf2..0000000
--- a/docs/resources/diagrams/ffa-ns-interrupt-handling-managed-exit.png
+++ /dev/null
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diff --git a/docs/resources/diagrams/ffa-ns-interrupt-handling-sp-preemption.png b/docs/resources/diagrams/ffa-ns-interrupt-handling-sp-preemption.png
deleted file mode 100644
index f110028..0000000
--- a/docs/resources/diagrams/ffa-ns-interrupt-handling-sp-preemption.png
+++ /dev/null
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