kselftest/arm64: Fix output formatting for za-fork

The za-fork test does not output a newline when reporting the result of
the one test it runs, causing the counts printed by kselftest to be
included in the test name. Add the newline.

Fixes: 266679ffd867 ("kselftest/arm64: Convert za-fork to use kselftest.h")
Cc: <stable@vger.kernel.org> # 6.4.x
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20231116-arm64-fix-za-fork-output-v1-1-42c03d4f5759@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

kselftest/arm64: Convert za-fork to use kselftest.h

Now that kselftest.h can be used with nolibc convert the za-fork test to
use it. We do still have to open code ksft_print_msg() but that's not the
end of the world. Some of the advantage comes from using printf() which we
could have been using already.

This does change the output when tests are skipped, bringing it in line
with the standard kselftest output by removing the test name - we move
from

ok 0 skipped

to

ok 1 # SKIP fork_test

The old output was not following KTAP format for skips, and the
numbering was not standard or consistent with the reported plan.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

selftests/arm64: Add a testcase for handling of ZA on clone()

Add a small testcase that attempts to do a clone() with ZA enabled and
verifies that it remains enabled with the same contents. We only check
one word in one horizontal vector of ZA since there's already other tests
that check for data corruption more broadly, we're just looking to make
sure that ZA is still enabled and it looks like the data got copied.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220419112247.711548-40-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>