Revert "packet: fix race condition in packet_set_ring"

Re-adding lock_sock(sk) and release_lock(sk) back in packet_set_ring()
is incorrect and causing deadlock.
This reverts commit e5137232.

Change-Id: I1e5aa60d155f2c0803c127dc3e2e9dd81807e6f3
Signed-off-by: Srinivasa Rao Kuppala <srkupp@codeaurora.org>