fix for "kasan: improve vmalloc tests"

fix for "kasan: improve vmalloc tests"

vmap_tags() and vm_map_ram_tags() pass invalid page array size to
vm_map_ram() and vm_unmap_ram().  It's supposed to be 1, but it's 1 <<
order == 2 currently.

Remove order variable (it can only be 0 with the current code) and
hardcode the number of pages in these tests.

Link: https://lkml.kernel.org/r/865c91ba49b90623ab50c7526b79ccb955f544f0.1644950160.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>