Refactor getConfig to support explicit type handling am: 0cd991388f am: 8fae23408e am: 127c4371ab

Original change: https://android-review.googlesource.com/c/platform/packages/services/Iwlan/+/2853574

Change-Id: I53d79dbfd9e1053ecb1e59ae40f7a4755132a6e5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>