use static const instead of #define (DIS)ALLOW am: a09c2bbe49 am: f142ddf4b1 am: 636993817d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2777123

Change-Id: Ie4c9e7f9f36909cfd58332fa154c095fe0fa5226
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>