daq1_spi: Delete device specific macro instantiation

projects/daq1/common/daq1_spi.v

@@ -108,13 +108,10 @@ module daq1_spi (
     end
   end
 
-  // io butter
+  // io logic
 
-  IOBUF i_iobuf_sdio (
+  assign spi_miso = spi_sdio;
-    .T (spi_enable_s),
+  assign spi_sdio = (spi_enable_s == 1'b1) ? 1'bz : spi_mosi;
-    .I (spi_mosi),
-    .O (spi_miso),
-    .IO (spi_sdio));
 
 endmodule