Integrate meta-seconorth-machine/yocto-install-workarround

Commit: seco-ne/yocto/layers/meta-seconorth-machine@956a0653

yocto-install: Workarround for seco-mx6-fsl build

As the u-boot for seco-mx6-fsl does not work yet, the install script should only be generated for seco-mx6 instead for all mx6q machines.