retry with traffic descriptor

Before this change, only APN-based network capability is supported.
However, we'd like to support retry base on traffic descriptor such as
slice bandwidth/latency.

Also replaced a hard coding capability NOT_CONSTRAINED to be the
official API.

Flag: EXEMPT bugfix
Test: voice call + data browsing
Test: atest
Fix: 347619206
Change-Id: I821a64ddb424b1800fad50e4cbcf97af47cca1b5