soc: intel_adsp: tools: align code style in maps_regs()

Cosmetic change to align code style when initializing DSP registers. The
code in intel_is_ace() branch was moved as-is from acetool.py when the
two tools were merged to make reviewing easier. Fix the code style to be
coherent in the merged cavstool.py. No functional change.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>