Read preferred IKE protocol from carrier config am: 4c195ab2 am: c294baae am: 591a5d48 am: 0a187906 am: 32202ac8

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2479756



Change-Id: I6fe62f8aafdd242997e4c8185243c00fd5970c41
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>