bta: Break out internal header bta::dm::bta_dm_disc_int.h am: febe7092 am:...

bta: Break out internal header bta::dm::bta_dm_disc_int.h am: febe7092 am: 9673062d am: 481c6edd

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2829013



Change-Id: Id27712a902784f085cb425a70d5af3b77af130d0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>