mm: update core kernel code to use vm_flags_t consistently

The core kernel code is currently very inconsistent in its use of
vm_flags_t vs.  unsigned long.  This prevents us from changing the type of
vm_flags_t in the future and is simply not correct, so correct this.

While this results in rather a lot of churn, it is a critical
pre-requisite for a future planned change to VMA flag type.

Additionally, update VMA userland tests to account for the changes.

To make review easier and to break things into smaller parts, driver and
architecture-specific changes is left for a subsequent commit.

The code has been adjusted to cascade the changes across all calling code
as far as is needed.

We will adjust architecture-specific and driver code in a subsequent patch.

Overall, this patch does not introduce any functional change.

Link: https://lkml.kernel.org/r/d1588e7bb96d1ea3fe7b9df2c699d5b4592d901d.1750274467.git.lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <[email protected]>
Acked-by: Kees Cook <[email protected]>
Acked-by: Mike Rapoport (Microsoft) <[email protected]>
Acked-by: Jan Kara <[email protected]>
Acked-by: Christian Brauner <[email protected]>
Reviewed-by: Vlastimil Babka <[email protected]>
Acked-by: Oscar Salvador <[email protected]>
Reviewed-by: Pedro Falcato <[email protected]>
Acked-by: Zi Yan <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Liam R. Howlett <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Jarkko Sakkinen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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