Remove tunerId (it is always 0x38) and an unused struct
Remove the chip paramter to DL_ApPwCtrl - we only have chip 0.  Plus a couple of other small cleanups
Remove more unused code
Remove DL_SetBusTuner function - it was only used to set the booted flag.  Also only load the firmware if it is not already running.
Incorporate the ontents of DL_Initialize into Device_init