As of today, dp_peer.c has the peer management and rx_tid
functionality(create/setup/remove) which is used by the REO HW.
WCN6450 does not have REO HW and dp_rx_tid functionality is not
required for WCN6450. Hence, separate out dp rx tid functionality
from dp_peer.c so that we can avoid compiling unnecessary code
for WCN6450.
Change-Id: I322823704f38ff72e485f050941be6b1254bad09
CRs-Fixed: 3383330