tools: tests: avoid splitting and globbing

tools: tests: avoid splitting and globbing

Fix shellcheck SC2046[1], SC2068[2], SC2068[3] and SC2206[4], all of
which are related to avoiding word splitting and globbing.

[1] https://www.shellcheck.net/wiki/SC2046
[2] https://www.shellcheck.net/wiki/SC2068
[3] https://www.shellcheck.net/wiki/SC2086
[4] https://www.shellcheck.net/wiki/SC2206

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20240603115628.102616-9-warthog618@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>