Increase size of kelvin_scalar_tests to prevent timeouts

Change-Id: I250a34a0dee6f4dd1e0e80df8ab02b45d409fd07

hdl/chisel/src/kelvin/BUILD

diff --git a/hdl/chisel/src/kelvin/BUILD b/hdl/chisel/src/kelvin/BUILD
index d55061d..6fe855e 100644
--- a/hdl/chisel/src/kelvin/BUILD
+++ b/hdl/chisel/src/kelvin/BUILD
@@ -174,7 +174,7 @@
 
 chisel_test(
     name = "kelvin_scalar_tests",
-    size = "medium",
+    size = "large",
     srcs = [
         "scalar/AluTest.scala",
         "scalar/MluTest.scala",