imx6sxsabreauto: Use u-boot-imx until u-boot-fslc has SabreAUTO support
Currently the U-Boot FSLC does not has the i.MX6SoloX SabreAUTO
support so for the time being we are using the U-Boot i.MX fork
provided by Freescale as part of 3.14-1.0.0 BSP.
While on that, drop the UBOOT_ENTRYPOINT setting as it is a
duplication of the value of 'imx-base.inc' file.
Change-Id: I9419b6ba5e82d9ca3d12ed3cf339a23ab9b738ac Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
