selftests/mm: gup_test: conform test to TAP format output

[ Upstream commit cb6e7cae ]

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/20240102053807.2114200-1-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: 8b65ef5a ("selftests/mm: Fix build with _FORTIFY_SOURCE")
Signed-off-by: Sasha Levin <sashal@kernel.org>