Unicorn/others: Add SDCard library from micropython-lib to RPI_PICO_W builds.

micropython/board/RPI_PICO_W/manifest.py

@@ -2,6 +2,9 @@ include("$(PORT_DIR)/boards/manifest.py")
 
 require("bundle-networking")
 
+# SD Card
+require("sdcard")
+
 # Bluetooth
 require("aioble")