kexec/kdump: RMO region does not exist in drconf memory

The RMO region can only exist in '/memory@0' node in the device tree.
While adding support for '/ibm,dynamic-reconfiguration-memory' in
kexec-tools, I incorrectly extended the code of '/memory@' nodes to
drconf memory with the assumption that what applies to '/memory@'
nodes would also apply to drconf memory. This is incorrect and
hence removing the code from kexec-tools now.

With this code in place, kexec on kexec fails. The first kexec
works because '/memory@0' node is read after drconf memory and
that correctly sets rmo_base and rmo_top from '/memory@0' node.
While in the kexec'ed kernel, '/ibm,dynamic-reconfiguration-memory'
is read after '/memory@xxx' nodes and this incorrectly sets both
rmo_base and rmo_top from drconf memory.

Sorry for introducing this bug.

Signed-off-by: Chandru Siddalingappa <chandru@linux.vnet.ibm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

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