include: fastboot: boot: override kernel-start-message

While booting HW like e850-96, LAVA failes to match the kerel boot msg
['Linux version [0-9]'], When that happens the auto-login-action fails
which means that the job fails.
By changing the string that LAVA should search for
'kernel-start-message' to something that actually shows up in the log
makes the auto-login-action pass and the kernel boots up fine.
This is only true if the kernel_start_message variable is set to a
string for LAVA to match.

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>

lava_test_plans/include/fastboot.jinja2

@@ -270,6 +270,10 @@ reboot_to_fastboot: {{ reboot_to_fastboot }}
 
 {% block boot_target %}
 - boot:
+{% if kernel_start_message is defined and kernel_start_message %}
+    parameters:
+      kernel-start-message: {{ kernel_start_message }}
+{% endif %}
 {% if lxc_project == true %}
     namespace: target
 {% endif %}