SystemUI refer CarrierConfig timeout(Second) to show 5G icon gracefully
System UI will show the 5G icon and post message delay by config value
after the device connect to a 5G cell to make the UX better
System UI stop displaying 5G icon when below conditions matched
1. device disconnect from 5G cell
2. the timer is expired.
Fixes: 136636141
Bug: 136107473
Test: atest SystemUITests
Test: enable SystemUI Demo Mode, simulate mServiceState callback 5G
Test: adb shell am broadcast -a com.android.systemui.demo -e command network
-e mobile show -e datatype 5g -e level 4
Test: adb shell am broadcast -a com.android.systemui.demo -e command network
-e mobile show -e datatype 5g+ -e level 4
Design: go/sysui_5g_signal_timer
Change-Id: I5e723c3edf28d31725fa9d847ed3569a1c322739
767c0db68a