[AST] Fix analog out contention

Signed-off-by: Jacob Levy <jacob.levy@opentitan.org>
diff --git a/hw/top_earlgrey/ip/ast/rtl/ast.sv b/hw/top_earlgrey/ip/ast/rtl/ast.sv
index 4be7d90..97501a8 100644
--- a/hw/top_earlgrey/ip/ast/rtl/ast.sv
+++ b/hw/top_earlgrey/ip/ast/rtl/ast.sv
@@ -562,7 +562,7 @@
 assign usb_io_pu_cal_o  = {UsbCalibWidth{1'b0}};
 //
 assign ast2padmux_o   = {Ast2PadOutWidth{1'b0}};
-`ifndes ANALOGSIM
+`ifndef ANALOGSIM
 assign ast2pad_t0_ao  = 1'bz;
 assign ast2pad_t1_ao  = 1'bz;
 `else