devtool: Don't recursively look for .devtoolbase in --basepath
If the user specifies --basepath on the commandline, only the directory
specified should be searched for .devtoolbase. Otherwise when --basepath
is a child of the sdk directory, .devtoolbase will always be found and
devtool will only show options meant to be used within an sdk.
Signed-off-by: Randy Witt <randy.e.witt@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
