bpf: get rid of DISABLE_BTF_ON_USER_BUILDS macro am: da723a059e

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3226114

Change-Id: Ifb64e906bcc6baf0f22bfb42bfe74b6ef580cbd4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>