[U-Boot] Test failures in u-boot/master on NVIDIA HW with recent push

[Stephen Warren]

Tom,

The recent set of patches pushed to u-boot/master cause DFU failures on 
both Jetson TK1 and Jetson TX1 (i.e. all platforms where I run the DFU 
test) with the following in the log:

host:
dfu-util -a 0 -U 
/var/lib/jenkins/workspace/u-boot-denx_uboot-master-test-py/U_BOOT_BOARD/jetson-tk1/build/u-boot/jetson-tk1/dfu_readback.bin 
-p 3-2.3

target:
** Reading file would overwrite reserved memory **
dfu: Read error!
dfu_read: Failed to fill buffer
Tegra124 (Jetson TK1) #

I noticed some lmb fixes in the list, so I guess it's due to that.