tools: labs: qemu: Make rootfs disk size power of 2

In some configurations Qemu requires rootfs image to be a size of 2.
Resize the yocto rootfs to 64MB for now to fix the following error
when booting ARM rootfs:

	qemu-system-arm: Invalid SD card size: 40 MiB
	SD card size has to be a power of 2, e.g. 64 MiB.
	You can resize disk images with 'qemu-img resize <imagefile> <new-size>'
	(note that this will lose data if you make the image smaller than it currently is).

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>

Author: dbaluta

tools/labs/qemu/prepare-image.sh

@@ -3,7 +3,7 @@
 size=$(stat -c%s $1)
 if [ $size -lt 50000000 ]; then
     e2fsck -f $1
-    resize2fs $1 50M
+    resize2fs $1 64M
 fi
 
 TMP=$(mktemp -d)