soc: intel_adsp: tools: fix ace15 ROM status check in cavstool.py

Fix definition for ROM status register for ACE1.5. The value should be
same as ACE2.0 and only different for ACE3.0.

Fixes: 6ad9b6cc ("soc: intel_adsp: tools: add intel_adsp_ace30
support to cavstool.py")
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>