Revert "sdcard_image: align partitions with flash pages"

This has 2 problems:

1) | Warning: partition 1 does not end at a cylinder boundary
   |
   | sfdisk: I don't like these partitions - nothing changed.

2) CCCCCCCCC on the beaglebone, the ROM code doesn't accept it after fixing 1) with --force

This reverts commit ed09701ebe.

classes/sdcard_image.bbclass

@@ -46,9 +46,9 @@ IMAGE_CMD_sdimg () {
 	SIZE=$(/sbin/fdisk -l ${LOOPDEV} | grep Disk | grep bytes | awk '{print $5}')
 	CYLINDERS=$(echo $SIZE/255/63/512 | bc)
 	{
-	echo 128,130944,0x0C,*
-	echo 131072,,,-
-	} | /sbin/sfdisk -D -uS -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
+	echo ,9,0x0C,*
+	echo ,,,-
+	} | /sbin/sfdisk -D -H 255 -S 63 -C ${CYLINDERS} ${LOOPDEV}
 
 	# Prepare loop devices for boot and filesystem partitions
 	BOOT_OFFSET=32256