[dv] Cleanup lint warnings in clk_rst_if

Signed-off-by: Srikrishna Iyer <sriyer@google.com>

hw/dv/sv/common_ifs/clk_rst_if.sv

diff --git a/hw/dv/sv/common_ifs/clk_rst_if.sv b/hw/dv/sv/common_ifs/clk_rst_if.sv
index 105f606..3a27ac0 100644
--- a/hw/dv/sv/common_ifs/clk_rst_if.sv
+++ b/hw/dv/sv/common_ifs/clk_rst_if.sv
@@ -185,7 +185,7 @@
   // 2 - async assert, async dessert
   // 3 - clk gated when reset asserted
   // Note: for power on reset, please ensure pre_reset_dly_clks is set to 0
-  // TODO #2338 issue workaround - $urandom call moved from default argument value to function body 
+  // TODO #2338 issue workaround - $urandom call moved from default argument value to function body
   task automatic apply_reset(int pre_reset_dly_clks   = 0,
                              integer reset_width_clks = 'x,
                              int post_reset_dly_clks  = 0,
@@ -214,6 +214,13 @@
         #(dly_ps * 1ps);
         o_rst_n <= 1'b1;
       end
+      default: begin
+`ifdef VERILATOR
+        $error({msg_id, $sformatf("rst_n_scheme %0d not supported", rst_n_scheme)});
+`else
+        `uvm_fatal(msg_id, $sformatf("rst_n_scheme %0d not supported", rst_n_scheme))
+`endif
+      end
     endcase
     wait_clks(post_reset_dly_clks);
   endtask