Remove unused bazel rules

Change-Id: Iacd51082acd2f5014588cdb0e123eaf58f8f77d3

hdl/chisel/BUILD

diff --git a/hdl/chisel/BUILD b/hdl/chisel/BUILD
index 8f5a41f..2a7af70 100644
--- a/hdl/chisel/BUILD
+++ b/hdl/chisel/BUILD
@@ -1,9 +1,4 @@
-load("@io_bazel_rules_scala//scala:scala.bzl", "scala_library", "scala_binary")
-load("@kelvin_hw//rules:chisel.bzl", "chisel_binary",
-                                     "chisel_library",
-                                     "chisel_cc_library")
-load("@rules_hdl//verilog:providers.bzl", "verilog_library")
-load("@rules_hdl//verilator:defs.bzl", "verilator_cc_library")
+load("@kelvin_hw//rules:chisel.bzl", "chisel_cc_library", "chisel_library")
 
 chisel_library(
     name = "common",
@@ -15,7 +10,7 @@
     srcs = glob(["src/kelvin/**/*.scala"]),
     deps = [
         ":common",
-    ]
+    ],
 )
 
 chisel_cc_library(
@@ -120,4 +115,4 @@
     chisel_lib = ":kelvin",
     emit_class = "kelvin.EmitVSt",
     module_name = "VSt",
-)
\ No newline at end of file
+)