arm64/mm: Define dummy pud_user_exec() when using 2-level page-table

With only two levels of page-table, the generic 'pud_*' macros are
implemented using dummy operations in pgtable-nopmd.h. Since commit
730a11f982e6 ("arm64/mm: add pud_user_exec() check in
pud_user_accessible_page()"), pud_user_accessible_page() unconditionally
calls pud_user_exec(), which is an arm64-specific helper and therefore
isn't defined by pgtable-nopmd.h. This results in a build failure for
configurations with only two levels of page table:

   arch/arm64/include/asm/pgtable.h: In function 'pud_user_accessible_page':
>> arch/arm64/include/asm/pgtable.h:870:51: error: implicit declaration of function 'pud_user_exec'; did you mean 'pmd_user_exec'? [-Werror=implicit-function-declaration]
     870 |         return pud_leaf(pud) && (pud_user(pud) || pud_user_exec(pud));
         |                                                   ^~~~~~~~~~~~~
         |                                                   pmd_user_exec

Fix the problem by defining pud_user_exec() as pud_user() in this case.

Link: https://lore.kernel.org/r/[email protected]
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

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