Adding configurable default behavior for Enabling Modem on Boot

Test: make
Manual test:
Panther and Eos
1) Build for panther with all changes (i.e. ab/P62562126 for panther)
2) Flash and boot for the first time
3) get bugreport
> adb bugreport
4) Find SST logs that shows setPowerStateToDesired i.e.:
"setPowerStateToDesired: mDeviceShuttingDown=false, mDesiredPowerState=true, getRadioState=1, mRadioPowerOffReasons=[0], IMS reg state=false, pending radio off=false"

Result: SST does not have "mDesiredPowerState=true"

Bug: 297585092
Change-Id: I22df259e337aa4996dfab10cf158a33a183f0b2d
Defer-CP-To-Master: 296576141