[Boot2Qt] QStorageInfo::device() returns non-existent root device

The QStorageInfo::device() should return the device of the root volume, but instead it return always /dev/root which is non-existent in the Boot2Qt image.

Steps to reproduce:

1. Run the attached example project

Expected result:

1. The device of the root volume should be returned. For example in Boot2Qt image for Apalis it should be /dev/mmcblk1p2  (root@b2qt-apalis-imx6:~# mount/dev/mmcblk1p2 on / type ext4 (rw,relatime,data=ordered))

Actual result:

1. The /dev/root is returned.