cummulative fixes, RTL uuid trace, texture unit fixes, simx timing fixes

hw/rtl/interfaces/VX_perf_tex_if.sv

@@ -0,0 +1,23 @@
+`ifndef VX_PERF_TEX_IF
+`define VX_PERF_TEX_IF
+
+`include "VX_define.vh"
+
+interface VX_perf_tex_if ();
+
+    wire [`PERF_CTR_BITS-1:0] mem_reads;
+    wire [`PERF_CTR_BITS-1:0] mem_latency;
+
+    modport master (
+        output mem_reads,
+        output mem_latency
+    );
+
+    modport slave (
+        input mem_reads,
+        input mem_latency
+    );
+
+endinterface
+
+`endif