test_firmware: replace syfs fallback check with kconfig_has helper

Now that we have a kconfig checker just use that instead of relying
on testing a sysfs directory being present, since our requirements
are spelled out.

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed