The kernel size has grown to a point where the original load address might not work
due to memory region overlap. This updates the instructions to use larger memory
addresses which avoids the problem.

[YOCTO #2430]

(From meta-yocto rev: 0d1949a9ca62f33a32671e57625ad14eb9221423)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>