Move minigbm.debug property to minigbm_msm/device.mk am: d898026dd5

Original change: https://android-review.googlesource.com/c/device/linaro/dragonboard/+/3026223

Change-Id: I4e4302c5f6980025badf613afac233a3466f663c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>