Merge "Remove sdkextension sdk definition" into rvc-dev am: f3b1cd617e am: e377b851d8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/SdkExtensions/+/11754284

Change-Id: I28ec6a136183a7ed86f9461b73b68f0c0cc850e9