arm: plug a zImage corner case

If a zImage is built with ARM_APPENDED_DTB enabled, the zImage will
look at the word following the zImage and check whether it contains
the DTB magic number.

Generally, kexec will clear the destination pages before copying the
zImage, but there is a corner case where the zImage is a multiple of
the page size, where the following page will not be touched.  Should
the first word in this page contain the DTB magic number, the data
following will be interpreted as a DTB image.

In order to make this bullet-proof, we must always initialise the word
following the zImage.  Arrange this by specifying the zImage memory
size one word bigger than the buffer size.

Signed-off-by: Russell King <rmk@armlinux.org.uk>
Signed-off-by: Simon Horman <horms@verge.net.au>

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