UPSTREAM: lib/test_meminit: add a kmem_cache_alloc_bulk() test

Upstream commit 03a9349ac0e095dea6ef8b5b7b14f9c23e5fabe6.

Make sure allocations from kmem_cache_alloc_bulk() and
kmem_cache_free_bulk() are properly initialized.

Link: http://lkml.kernel.org/r/20191007091605.30530-2-glider@google.com


Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Thibaut Sautereau <thibaut@sautereau.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Bug: 138435492
Test: Boot an ARM64 mobile device with and without init_on_alloc=1
Change-Id: I92476545a6212483136e58008736f333b0b36217
Signed-off-by: Alexander Potapenko <glider@google.com>