dfc: Not flow control NDP packets

Allow all NDP packets to be sent regardless of flow control state.
These packets are needed for address configuration even if the default
flow is disabled from the beginning of the call such as in 5G SA.

Change-Id: Ia10e41c5ec8e163b9682c6b4f553f9b102020042
Acked-by: Weiyi Chen <weiyic@qti.qualcomm.com>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>