Update findtoolchain to support Yocto build folder
Update findtoolchain to support Yocto build folder

Currently findtoolchain only tries to find a toolchain in /opt/swi,
which is not comfortable for developers that to reuse the toolchain
from their Yocto build environment.

Resolves: LE9XXX-775
Change-Id: I28dd8581faa90c97390313003599cffd9348e038

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af