Adjust DaynaPORT build buffers to fit in SRAM

Changes exceeded the DaynaPORT memory allocation. Decreased prefetch
buffer by 512 bytes.

platformio.ini

@@ -176,10 +176,10 @@ build_flags =
     -DZULUSCSI_DAYNAPORT
 ; These take a large portion of the SRAM and can be adjusted
     -DLOGBUFSIZE=8192
-    -DPREFETCH_BUFFER_SIZE=6144
+    -DPREFETCH_BUFFER_SIZE=5632
     -DSCSI2SD_BUFFER_SIZE=57344
-    ; This controls the depth of 2 x NETWORK_PACKET_MAX_SIZE (1520 bytes)
-    ; For example a queue size of 10 would be 10 x 2 x 1520 = 30400 bytes
+    ; This controls the depth of NETWORK_PACKET_MAX_SIZE (1520 bytes)
+    ; For example a queue size of 10 would be 10 x 1520 = 15200 bytes
     -DNETWORK_PACKET_QUEUE_SIZE=18
 ; build flags mirroring the framework-arduinopico#v3.6.0-DaynaPORT static library build
     -DPICO_CYW43_ARCH_POLL=1