ue txData more contextual, but still global as it is entangled with usrp driver
txData buffer is global and entangled even in usrp oai driver because of tx thread feature
it also makes weird combination with continuous tx usrp bug workaround
this MR makes most of the calls contextual but keep the globakl txData
later a MR should remove the global and tackle it with proper context, but we need to modify gNb, UE, 4G and probably all oai drivers