sdcard: drop to pru-uio by default

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>

tools/setup_sdcard.sh

@@ -1198,7 +1198,7 @@ populate_rootfs () {
 				echo "###pru_rproc (4.4.x-ti kernel)" >> ${wfile}
 				echo "#uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo" >> ${wfile}
 				echo "###pru_uio (mainline kernel)" >> ${wfile}
-				echo "#uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo" >> ${wfile}
+				echo "uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo" >> ${wfile}
 			fi
 			echo "###" >> ${wfile}
 			echo "###Cape Universal Enable" >> ${wfile}