fusion3: fix mkbootimg path

On some rare occations, mkbootimg will not be in path. We have the full
path in $(MKBOOTIMG), so let's use that instead.

Change-Id: Ibe5242844f64c1e3d097f9a326eeb5c4ee02ee60
fusion3: Enable NEEDS_VECTORIMPL_SYMBOLS required for the blobs.

Change-Id: Ie2e9872bb68f79bd92abf461b3ec889984667d57
fstab: vold: set correct label for usbdisk

Change-Id: I0c0004932288387b0c995e603d13ee7c1dfb3545

Conflicts:
	rootdir/fstab.qcom