Allow to resize a partition with a resizable filesystem on it

With the recent changes to resize logic (resizable is set to false until updateSizeInfo) it's now impossible to resize a partition with a resizable filesystem on it (such StorageDevice is considered as not resizable).
It seems that I need to updateSizeInfo before creating ActionResizeDevice object, but then it will be called again when proccessing the action.
So I think it's needed to introduce a distinct property for FS to show that it supports resizing in principle.