Remove -language-version flags from dokka am: 7b150bbe96 am: 77665b0384 am: f3d7b224f7 am: 836038d406

Original change: https://android-review.googlesource.com/c/platform/external/dokka/+/2666058

Change-Id: I00c6e1dc48a9e5562cf338ab75fe1679ee2c0ca4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>