[fpv/doc] Add nightly regression dashboard link

Add FPV nightly regression dashboard link to the Hardware dashboard
page.

Signed-off-by: Cindy Chen <chencindy@google.com>
diff --git a/hw/_index.md b/hw/_index.md
index 7bfe410..df7cab9 100644
--- a/hw/_index.md
+++ b/hw/_index.md
@@ -18,7 +18,7 @@
 ## Results of tool-flows
 
 * [DV simulation summary results, with coverage (nightly)](https://reports.opentitan.org/hw/top_earlgrey/dv/summary.html)
-* FPV summary results (nightly) (TBD)
+* [FPV summary results (nightly)](https://reports.opentitan.org/hw/top_earlgrey/fpv/summary.html)
 * [Lint summary results (nightly)](https://reports.opentitan.org/hw/top_earlgrey/lint/ascentlint/summary.html)
 * [Style lint summary results (nightly)](https://reports.opentitan.org/hw/top_earlgrey/lint/veriblelint/summary.html)