Simplify lint targets

The only core which needs lint waivers is ibex_core.core; it will then
inherit those waivers to other cores, such as ibex_core_tracing.core,
and higher-up users of these cores (such as the simple system).

Also remove the Verible lint configuration, which happens to be the
default by now. This fixes #736 by making it unnecessary.

ibex_core.core

@@ -154,10 +154,6 @@ targets:
           # RAM primitives wider than 64bit (required for ECC) fail to build in
           # Verilator without increasing the unroll count (see Verilator#1266)
           - "--unroll-count 72"
-      veriblelint:
-        ruleset: default
-        rules:
-          - "-parameter-name-style"
   format:
     filesets:
       - files_rtl

ibex_core_tracing.core

@@ -13,11 +13,6 @@ filesets:
       - rtl/ibex_core_tracing.sv
     file_type: systemVerilogSource
 
-
-  files_lint_verilator:
-    files:
-      - lint/verilator_waiver.vlt: {file_type: vlt}
-
 parameters:
   # The tracer uses the RISC-V Formal Interface (RVFI) to collect trace signals.
   RVFI:
@@ -100,19 +95,15 @@ parameters:
     description: "Number of PMP regions"
 
 targets:
-  default:
+  default: &default_target
     filesets:
       - files_rtl
     parameters:
       - RVFI=true
+    toplevel: ibex_core_tracing
 
   lint:
-    filesets:
-      # Note on Verilator waivers:
-      # You *must* include the waiver file first, otherwise only global waivers
-      # are applied, but not file-specific waivers.
-      - tool_verilator ? (files_lint_verilator)
-      - files_rtl
+    <<: *default_target
     parameters:
       - RVFI=true
       - SYNTHESIS=true
@@ -127,7 +118,6 @@ targets:
       - PMPGranularity
       - PMPNumRegions
     default_tool: verilator
-    toplevel: ibex_core_tracing
     tools:
       verilator:
         mode: lint-only
@@ -136,10 +126,6 @@ targets:
           # RAM primitives wider than 64bit (required for ECC) fail to build in
           # Verilator without increasing the unroll count (see Verilator#1266)
           - "--unroll-count 72"
-      veriblelint:
-        ruleset: default
-        rules:
-          - "-parameter-name-style"
   format:
     filesets:
       - files_rtl