[U-Boot] 32-bit Tegra build failure in u-boot-dm

[Stephen Warren]

Simon,

All 32-bit Tegra boards appear to be failing to build in u-boot-dm.git 
master branch with:

>   BINMAN  u-boot-tegra.bin
> binman: Unknown entry type 'u-boot-spl' in node '/binman/image1/u-boot-spl'
> /var/lib/jenkins/workspace/u-boot-denx_uboot_dm-master-build/src/u-boot/Makefile:1437: recipe for target 'u-boot-tegra.bin' failed
> make[1]: *** [u-boot-tegra.bin] Error 1
> make[1]: Leaving directory '/var/lib/jenkins/workspace/u-boot-denx_uboot_dm-master-build/build/u-boot/jetson-tk1'
> Makefile:148: recipe for target 'sub-make' failed
> make: *** [sub-make] Error 2
> make: Leaving directory '/var/lib/jenkins/workspace/u-boot-denx_uboot_dm-master-build/src/u-boot'