remove mlkem CDC; mlkem can now run at 50MHz

rtl/ip/mlkem/top/mlkem_axi_slave.v

@@ -1,9 +1,8 @@
 // mlkem_axi_slave.v — AXI4 (burst) slave wrapper for the ML-KEM core.
 // Makes the ML-KEM accelerator (KeyGen / Encaps / Decaps) CPU-controllable.
 //
-// This slave is placed behind an AXI clock-domain converter. Its AXI side and
-// mlkem_top both run in mlkem_clk; sys_clk masters reach it through Axi_CDC in
-// fft_mlkem_axi_slave.
+// This slave and mlkem_top run in the same clock domain as the shared
+// FFT/ML-KEM AXI window.
 //
 // Register map (byte offsets from base, e.g. virtual 0xbf400000):
 //   0x000 CTRL         W   bit0 = start (launches op selected in CONFIG)
@@ -27,8 +26,8 @@
 
 
 module mlkem_axi_slave (
-    input             clk,        // mlkem_clk AXI-side clock after Axi_CDC
-    input             resetn,     // mlkem_resetn, active low
+    input             clk,
+    input             resetn,     // active low
 
     // AXI Write Address Channel
     input      [4:0]  s_axi_awid,