[sw] Add patch_repo for riscv-compliance

The patch_repo has the latest version of riscv-compliance with a changed
OpenTitan target that works with the latest SW stack.

Signed-off-by: Greg Chadwick <gac@lowrisc.org>
diff --git a/sw/vendor/riscv_compliance.vendor.hjson b/sw/vendor/riscv_compliance.vendor.hjson
index c6018af..4f4210b 100644
--- a/sw/vendor/riscv_compliance.vendor.hjson
+++ b/sw/vendor/riscv_compliance.vendor.hjson
@@ -34,5 +34,13 @@
     "riscv-test-suite/rv32ui",
     "riscv-test-suite/rv64i",
     "riscv-test-suite/rv64im",
+    // FENCE.I test attemps write to flash memory so doesn't work in OT
+    "riscv-test-suite/rv32Zifencei",
   ]
+
+  patch_repo: {
+    url: "https://github.com/lowRISC/riscv-compliance.git",
+    rev_base: "master",
+    rev_patched: "ot",
+  }
 }