mm/gup: remove gup_fast_pgd_leaf() and clean up the relevant codes

mm/gup: remove gup_fast_pgd_leaf() and clean up the relevant codes

In the current kernel, only pud huge page is supported in some
architectures.  P4d and pgd huge pages haven't been supported yet.  And in
mm/gup.c, there's no pgd huge page handling in the follow_page_mask() code
path.  Hence it doesn't make sense to only have gup_fast_pgd_leaf() in
gup_fast code path.

Here remove gup_fast_pgd_leaf() and clean up the relevant codes.

Link: https://lkml.kernel.org/r/20250410035717.473207-4-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Yanjun.Zhu <yanjun.zhu@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>