devtool: modify: fix source tree default name when mapping virtuals
If you for example ran devtool modify virtual/libusb0 without specifying
a source tree path, the default was <workspace>/sources/virtual/libusb0
which isn't correct - it should be using the mapped name i.e.
libusb-compat (in the default OE-Core configuration). Reorder some of
the code to ensure that the mapped name is used.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
