test-configs.yaml: set timeout for decoder tests on rk3399-gru-kevin

Set a 90 seconds timeout for the decoder test suites running on
rk3399-gru-kevin.

Signed-off-by: Laura Nao <[email protected]>

Author: laura-nao

config/core/test-configs.yaml

@@ -1696,6 +1696,8 @@ device_types:
     class: arm64-dtb
     boot_method: depthcharge
     filters: *arm64-chromebook-filters
+    params:
+      videodec_timeout: 90
 
   rk3399-puma-haikou:
     mach: rockchip