[otbn] Add OTBN to CI runs

I'm not sure whether this will work with Google's nightly
infrastructure, where it's not clear whether the test runners actually
have a repository to hand, but it *should* work for CI.

Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
diff --git a/hw/top_earlgrey/dv/top_earlgrey_sim_cfgs.hjson b/hw/top_earlgrey/dv/top_earlgrey_sim_cfgs.hjson
index 36a7d10..06cadf4 100644
--- a/hw/top_earlgrey/dv/top_earlgrey_sim_cfgs.hjson
+++ b/hw/top_earlgrey/dv/top_earlgrey_sim_cfgs.hjson
@@ -21,6 +21,7 @@
              "{proj_root}/hw/ip/kmac/dv/kmac_masked_sim_cfg.hjson",
              "{proj_root}/hw/ip/kmac/dv/kmac_unmasked_sim_cfg.hjson",
              "{proj_root}/hw/ip/otp_ctrl/dv/otp_ctrl_sim_cfg.hjson",
+             "{proj_root}/hw/ip/otbn/dv/uvm/otbn_sim_cfg.hjson",
              "{proj_root}/hw/ip/rv_timer/dv/rv_timer_sim_cfg.hjson",
              "{proj_root}/hw/ip/spi_device/dv/spi_device_sim_cfg.hjson",
              "{proj_root}/hw/ip/uart/dv/uart_sim_cfg.hjson",