fixed: OnRegister clears baseDevice when physical address already resolved

[jwmay2012]

During RegisterClient, SetConfiguration calls SetHDMIPort(baseDevice, port) which resolves the physical address and stores baseDevice (e.g. CECDEVICE_AUDIOSYSTEM). Then OnRegister calls SetPhysicalAddress(m_configuration) again, but since iPhysicalAddress is already valid from the earlier resolution, it takes the "provided physical address" path which zeroes out baseDevice and iHDMIPort:

https://github.com/Pulse-Eight/libcec/blob/libcec-7.1.1/src/libcec/CECClient.cpp#L229-L240

// CECClient.cpp:229 - SetPhysicalAddress(const libcec_configuration&)
// iPhysicalAddress was already set to 0x2100 by SetHDMIPort above,
// so this branch is taken and baseDevice gets wiped
if (CLibCEC::IsValidPhysicalAddress(configuration.iPhysicalAddress) &&
  (configuration.iPhysicalAddress != CEC_PHYSICAL_ADDRESS_TV) &&
  SetPhysicalAddress(configuration.iPhysicalAddress))
{
  if (m_configuration.bAutodetectAddress == 0)
    LIB_CEC->AddLog(CEC_LOG_DEBUG, "using provided physical address %04X", configuration.iPhysicalAddress);
  CLockObject lock(m_mutex);
  m_configuration.baseDevice       = CECDEVICE_UNKNOWN;         // was CECDEVICE_AUDIOSYSTEM
  m_configuration.iHDMIPort        = CEC_HDMI_PORTNUMBER_NONE;  // was 1
  m_configuration.iPhysicalAddress = configuration.iPhysicalAddress;
  return true;
}

After OnRegister returns, m_configuration.baseDevice is CECDEVICE_UNKNOWN. Kodi reads this back via GetCurrentConfiguration right after Open() completes, interprets it as "connected to TV", and persists that to its settings. Next boot, Kodi passes CECDEVICE_TV instead of CECDEVICE_AUDIOSYSTEM to SetHDMIPort, gets the wrong physical address, and CEC stops working.

The fix skips the SetPhysicalAddress call in OnRegister when the address is already resolved. No change to SetPhysicalAddress itself.

Tested on LibreELEC 12.2.1 with Pulse-Eight USB adapter behind a Yamaha AVR, baseDevice stays correct across reboots.

Related: https://forum.libreelec.tv/thread/30065-x86-64-cec-broke-after-updating-to-le-12-2-0/, #679, #687, #698, #699