jtreg: increase timeout for hotspot-compiler tests to 18 hours

This based on a recent run where the job took over 16 hours to complete,
so we add a little for some runtime variability.

Signed-off-by: Andrew McDermott <andrew.mcdermott@linaro.org>
diff --git a/lava-submit.py b/lava-submit.py
index bc68cba..8d6bb2c 100755
--- a/lava-submit.py
+++ b/lava-submit.py
@@ -15,7 +15,7 @@
     'e2eaudiotest': 7200,
     'ethernet': 800,
     'gatortests': 1200,
-    'jtreg-hotspot-compiler': 54000,
+    'jtreg-hotspot-compiler': 64800,
     'jtreg-hotspot-gc': 14400,
     'jtreg-hotspot-runtime': 36000,
     'jtreg-hotspot-sanity': 7200,