[DEV](Android) Make MTU and header size public
[DEV](Android) Make MTU and header size public

Change-Id: I1f86563bfe9bf2b7f669dfd387bd10533656820a

Parrot-Developers/ARSDKBuildUtils,aoi/ARSDKBuildUtils,Parrot-Developers/ARSDKBuildUtils,aoi/ARSDKBuildUtils,cvramire/ARSDKBuildUtils,cvramire/ARSDKBuildUtils