Revert "tbf: Do not kill DL TBF on Packet Resource Request"

This reverts commit e91bd3babd5c04a154f296607b401a5050dcba31.

That commit seems to cause hanging DL TBFs when there was a RACH
based UL TBF establishment while it that TBF is active. This could be
caused by the use of a different PDCH for the SBA.

Conflicts:
	tests/tbf/TbfTest.cpp
	tests/tbf/TbfTest.err
4 files changed