Restore external AnalogRX power function

[pitts-mo]

-Remove conditions for initial setting of AnalogRX power.
-Remove AnalogRX power state change beep.
-Restored AnalogRX power state checking to source selection.

The AnalogRX power state change beep was desirable for testing but seemed to just prompt desire for an optional goggle ready beep feature.

[pitts-mo]

Needs testing on Goggle2.

Boxpro testing?

Should internal analog module power be incorporated into the Auto power function to save power when goggle2/boxpro users switch sources?

[ligenxxxx]

I tested on BoxPro:

• From the source menu, go to analog/an in/hdzero, and the analog module is powered correctly.
• Using the toggle source, the analog module is powered correctly.

[pitts-mo]

If goggle2 is verified I plan to add additional logic for goggle2 internal/external selection.
if analog_module = 1 expansion module is turned ON else (analog_module = 0) expansion module will turn it OFF.