Increase timeout for CrosVM tests

CrosVM tests are randomly timing out on the build system. Increase their
timeout value from 3 minutes to 5 minutes.

Change-Id: I9a424569d54f3c4984531c327e1843405c5d9a09
diff --git a/Makefile b/Makefile
index a9b3745..e434889 100644
--- a/Makefile
+++ b/Makefile
@@ -322,7 +322,7 @@
 			   test-crosvm-pkvm-helloworld
 
 define gen_crosvm_helloworld_test
-	$(KUT_RUN_TEST) -d $(1) $(2) \
+	$(KUT_RUN_TEST) -d $(1) $(2) -t 300s \
 		-k $(KERNEL_IMAGE) \
 		-o $(CROSVM_HELLOWORLD_LOG_DIR)/$(1).log \
 		$(CROSVM_HELLOWORLD_SCRIPT_DIR)/host.sh -- \