[bazel] add build rules for for dvsim Hjson configs

The chip-level simulation Hjson configuration files will need to
referenced by a future `sh_test` rule that will be invoked as part of
the DV sim flow. This adds build rules to export this package to the
bazel repo.

Signed-off-by: Timothy Trippel <ttrippel@google.com>

hw/top_earlgrey/dv/BUILD

diff --git a/hw/top_earlgrey/dv/BUILD b/hw/top_earlgrey/dv/BUILD
new file mode 100644
index 0000000..29c8415
--- /dev/null
+++ b/hw/top_earlgrey/dv/BUILD
@@ -0,0 +1,14 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "config",
+    srcs = [
+        "chip_mask_rom_tests.hjson",
+        "chip_sim_cfg.hjson",
+        "chip_smoketests.hjson",
+    ],
+)