[UCE] Do not block indefinitely if the framework never receive a final result...

[UCE] Do not block indefinitely if the framework never receive a final result for capabilities request am: 8892764c am: 79637da5 am: 2dd466f8 am: 43a9fe03

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ims/+/1719882

Change-Id: I2da0c3f36480899c10181968773b7f0e63ff662b