Provisioning scripts need to install Yocto toolchains (32 and 64 bit)
so that the artifacts aren't needed to be unzipped during Qt builds.

Task-number: QTQAINFRA-1454
Change-Id: Idceeabb7aa9ffe2555fb98c94916f8429c32af75
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@qt.io>