crash dump memory reservation regression

[CAI Qian]

commit 3661ca66a42e306aaf53246fb75aec1ea01be0f0
x86, memblock: Fix crashkernel allocation

introduced a regression that crashkernel=512M
according to bisecting will fail like this,

crashkernel reservation failed - No suitable area found.
The full dmesg can be found here.

http://people.redhat.com/qcai/dmesg.bad

CAI Qian
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