mm/slab: replace slab_alloc_node() parameters with slab_alloc_context

mm/slab: replace slab_alloc_node() parameters with slab_alloc_context

The function takes all the parameters that exist as fields in
slab_alloc_context, except alloc_flags. Replace them with a single
pointer.

This moves slab_alloc_context initialization to a number of callers,
which is more verbose, but arguably also more clear than a long list of
parameters, and most do not use the 'lru' field.

This will also allow kmalloc_nolock() to call slab_alloc_node() and
reduce the special open-coding it currently has.

Link: https://patch.msgid.link/20260610-slab_alloc_flags-v2-10-7190909db118@kernel.org
Reviewed-by: Hao Li <hao.li@linux.dev>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Harry Yoo (Oracle) <harry@kernel.org>
Signed-off-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>