uboot-imx

x86: ifdtool: Check that U-Boot does not overlap other regions

Since U-Boot and its device tree can grow we should check that it does not
overlap the regions above it. Track the ROM offset that U-Boot reaches and
check that other regions (written after U-Boot) do not interfere.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>