dragonboards: refactor graphics configs to independent fragments am: 6749c910f3 am: 9e382093fe am: e6c956bbb7

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2750582

Change-Id: I9a9078abd454a65af4ba3c5ca5fe23560c3b5b7c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>