Add documentation for the powerpc memtrace debugfs files
CONFIG_PPC_MEMTRACE must be set to use this feature. This can only be used on powernv platforms. Signed-off-by: NRashmica Gupta <rashmica.g@gmail.com> [mpe: Update dates and kernel versions, mention size is in bytes] Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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