ncsid: Fix if_packet warnings

The new Docker CI now hits the following error.
```
/usr/include/linux/if_packet.h:24:17: error: flexible array member 'sockaddr_ll::<unnamed union>::<unnamed struct>::sll_addr_flex' not at end of 'class ncsi::SockIO'
   24 |                 __DECLARE_FLEX_ARRAY(unsigned char, sll_addr_flex);
      |                 ^~~~~~~~~~~~~~~~~~~~
../subprojects/ncsid/src/ncsi_sockio.h:55:15: note: next member 'const int ncsi::SockIO::kpoll_timeout_' declared here
   55 |     const int kpoll_timeout_ = 10;
      |               ^~~~~~~~~~~~~~
../subprojects/ncsid/src/ncsi_sockio.h:29:7: note: in the definition of 'class ncsi::SockIO'
   29 | class SockIO : public net::SockIO
```

Removed the sockaddr_ll variable.

Change-Id: I67e700f6cd728bfbc822c1b8661915f8306711a1
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/subprojects/ncsid/src/ncsi_sockio.cpp b/subprojects/ncsid/src/ncsi_sockio.cpp
index 259386c..ec28c42 100644
--- a/subprojects/ncsid/src/ncsi_sockio.cpp
+++ b/subprojects/ncsid/src/ncsi_sockio.cpp
@@ -41,12 +41,7 @@
 {
     iface.set_sock_flags(sockfd_, IFF_PROMISC);
 
-    std::memset(&sock_addr_, 0, sizeof(sock_addr_));
-
-    sock_addr_.sll_family = AF_PACKET;
-    sock_addr_.sll_protocol = htons(ETH_P_ALL);
-
-    RETURN_IF_ERROR(iface.bind_sock(sockfd_, &sock_addr_),
+    RETURN_IF_ERROR(iface.bind_sock(sockfd_),
                     "ncsi::SockIO::bind_to_iface failed");
 
     return 0;