qcacmn: Fix -Wmissing-prototypes in dp_peer.c

We want to enable the compiler's -Wmissing-prototypes switch, but
there is existing code in dp_peer.c that is generating warnings.  Fix
these warnings by making the following functions static:
	dp_peer_find_hash_find()
	dp_rx_tid_update_wifi3()
	dp_rx_tid_delete_cb()
	dp_rx_tid_delete_wifi3()

And by exporting a public prototype for:
	dp_peer_find_hash_erase()

Change-Id: I5c945f27c0334a4d88da6136de8aacae2ba840a7
CRs-Fixed: 1108459
2 files changed