powerpc/fsl_booke/32: implement KASLR infrastructure

This patch add support to boot kernel from places other than KERNELBASE.
Since CONFIG_RELOCATABLE has already supported, what we need to do is
map or copy kernel to a proper place and relocate. Freescale Book-E
parts expect lowmem to be mapped by fixed TLB entries(TLB1). The TLB1
entries are not suitable to map the kernel directly in a randomized
region, so we chose to copy the kernel to a proper place and restart to
relocate.

The offset of the kernel was not randomized yet(a fixed 64M is set). We
will randomize it in the next patch.

Signed-off-by: Jason Yan <[email protected]>
Tested-by: Diana Craciun <[email protected]>
Reviewed-by: Christophe Leroy <[email protected]>
Signed-off-by: Scott Wood <[email protected]>
[mpe: Use PTRRELOC() in early_init()]
Signed-off-by: Michael Ellerman <[email protected]>

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