tools: config-create: exclude kernel-area from mem-allocation

tools: config-create: exclude kernel-area from mem-allocation

When allocating memory for jailhouse, we currently don't look at where
the kernel lives on the system. In case our `memmap` overlaps with this
area, the kernel will just ignore the kernel-cmd-option and out generated
configuration will be invalid.

To fix this, the script now looks out for any kernel-region while
parsing the tree from /proc/iomem and splits the parent-region on the
kernels boundaries. This region will then not be considered anymore and
could additionally be handled special in other cases in the future. The
config will contain it as extra memory-region with all rights.

Signed-off-by: Benjamin Block <bebl@mageta.org>
Reviewed-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>