ci: add character_delay to db410c LAVA template

We're experiencing often one-character-errors in the console output from
db410c. The character_delay in the job template should mitigate this
issue.

Signed-off-by: Milosz Wasilewski <[email protected]>

Author: mwasilew

ci/lava/dragonboard-410c/boot.yaml

@@ -63,6 +63,8 @@ actions:
         TESTS: "pwd, uname -a, ip a, dmesg" 
 device_type: {{DEVICE_TYPE}}
 job_name: boot test ({{DEVICE_TYPE}}) {{GITHUB_RUN_ID}}
+context:
+  test_character_delay: 10
 metadata:
   build-commit: '{{GITHUB_SHA}}'
 timeouts: