Vivek found some problems with old kexec-tools.
We keep the old crashkernel=X to old behavoir, so it will not break
old kexec-tools.
Add crashkernel=X,high to support new kexec-tools that supports loading high.
when high is used, memblock will search from top to low.
if the allocated one is above 4G, kernel will try to auto allocate
72M under 4G for swiotlb.
user could crashkernel=Y,low to change 72M to other value.
-v2: reorder the patch sequences
crashkernel=X,high, crashkernel=Y,low only handle simple form.
crashkernel=X will override crashkernel=X;high crashkernel=Y;low
Thanks
Yinghai
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