powerpc/e500: QEMU freeze without any output when kernel size is a bit big

When the kernel is big, QEMU freezes

Detailed analysis at https://github.com/linuxppc/issues/issues/208

Summary:

Looks like we enter u-boot with:

    Kernel at 0x2000000 and fdt at 0x2700000

Indeed, the problem is in qemu.

u-boot gets loaded at 0xf00000
fdt gets loaded at 0xf00000 + 0x1800000 = 0x2700000
then kernel gets loaded at 0x2000000, so when it is big it runs over the fdt.

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