selftests/mm: conform test to TAP format output

[ Upstream commit 9a21701edc41465de56f97914741bfb7bfc2517d ]

Conform the layout, informational and status messages to TAP.  No
functional change is intended other than the layout of output messages.

Link: https://lkml.kernel.org/r/20240101083614.1076768-1-usama.anjum@collabora.com


Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: d4202e66a4b1 ("selftests/mm: compaction_test: fix bogus test success on Aarch64")
Signed-off-by: Sasha Levin <sashal@kernel.org>