htm: Allow nest htm in htm_toggle_debug_bit()
htm: Allow nest htm in htm_toggle_debug_bit()

Currently htm_toggle_debug_bit() assumes the target's parent is a core
but this is only the case for core htm. For nest htm, the target's
parent is a chip.

Also for nest, we don't need to toggle this bit.

This detects the nest htm case and just returns.

Signed-off-by: Michael Neuling <7b0ab45a730e48a69239010b5b8fe5fa4e8eaac6@neuling.org>

open-power/pdbg,open-power/pdbg,open-power/pdbg