nitrogen6x: 6x_bootscript-yocto: fix ft5x06.screenres reference to match driver

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nit6xlite bootscript: no SATA on Nitrogen6_Lite board

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nit6xlite bootscript: add support for loading DTB

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nit6xlite bootscript: allow override of rootfs partition

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
nit6xlite: add Yocto-specific boot script

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>