LoadPin: Refactor read-only check into a helper

In preparation for allowing mounts to shift when not enforced, move
read-only checking into a separate helper.

Cc: Paul Moore <[email protected]>
Cc: James Morris <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Reviewed-by: Serge Hallyn <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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