tests: expand timeout information for aarch64/sbsa-ref

'Test might timeout' means nothing. Replace it with useful information
that it is emulation of pointer authentication what makes this test run
too long.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Message-id: 20240910-b4-move-to-freebsd-v5-3-0fb66d803c93@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
1 file changed