selftests/mm: add more mseal traversal tests

Add more mseal traversal tests across VMAs, where we could possibly screw
up sealing checks.  These test more across-vma traversal for mprotect,
munmap and madvise.  Particularly, we test for the case where a regular
VMA is followed by a sealed VMA.

[[email protected]: remove incorrect comment, per review]
[[email protected]: remove the correct comment, per Pedro]
[[email protected]: fix mseal's length]
  Link: https://lkml.kernel.org/r/vc4czyuemmu3kylqb4ctaga6y5yvondlyabimx6jvljlw2fkea@djawlllf45xa
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Pedro Falcato <[email protected]>
Reviewed-by: Liam R. Howlett <[email protected]>
Reviewed-by: Lorenzo Stoakes <[email protected]>
Cc: Jeff Xu <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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