dragonboards: Enable system_dlkm partition support am: b0274055b8

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/2686346

Change-Id: I9e7fd860ae854ea70cb75debc8320ee20d083091
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>