[SB][Sat] Add demo repo for device-based satellite.

Fixes: 323522792
Test: See below:
1) `adb shell am broadcast -a com.android.systemui.demo -e command
   enter` -> starts demo mode
2) `adb shell am broadcast -a com.android.systemui.demo -e command
   network -e mobile show -e level 0` -> sets mobile to be
   out-of-service
3) Wait 10s
4) Verify dimmed satellite icon appears
5) `adb shell am broadcast -a com.android.systemui.demo -e command
network -e satellite show -e level 4 -e connection connected` -> Verify
full satellite icon appears with level
6) Update the `level` value or `connection` value in the satellite
   command -> Verify satellite icon adjusts appropriately
7) `adb shell am broadcast -a com.android.systemui.demo -e command
   network -e mobile show -e level 1` -> sets mobile to be in-service,
   so verify satellite icon disappears
Test: all unit tests in the statusbar.pipeline.satellite directory
Flag: ACONFIG com.android.internal.telephony.flags.oem_enabled_satellite_flag
NEXTFOOD

Change-Id: I43622852763f6ac1d28446e0afd77a8cb92d26e0