mm/vmalloc: cleanup gfp flag use in new_vmap_block()

mm/vmalloc: cleanup gfp flag use in new_vmap_block()

The only caller, vb_alloc(), passes GFP_KERNEL into new_vmap_block() which
is a subset of GFP_RECLAIM_MASK.  Since there's no reason to use this mask
here, remove it.

Link: https://lkml.kernel.org/r/20251121094405.40628-5-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Acked-by: SeongJae Park <sj@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>