Dump only NORMAL priority information if no priority assigned

The legacy design of "dumpsys connectivity" will only dump
information with NORMAL priority. It was updated to provide
both NORMAL and HIGH priority information in order to support
dump in bugreport. However, it will also affect the result
using dumpsys connectivity.

Update design to dump NORMAL priority only to align with legacy
design.

Bug: 188387185
Test: adb shell dumpsys connectivity
Test: adb bugreport and check the result in bugreport
Change-Id: I6825c5038e48e3060c0c3ad1512bd584ef6d10a7