ANDROID: GKI: remove condition causing sk_buff struct ABI differences

Remove condition for including struct sk_buff members based on
CONFIG_BRIDGE_NETFILTER config.

Bug: 151840548
Test: build
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Iee626843e107e8d64c3c6c4a1cc9c08f4e38f5af
Merged-In: Iee626843e107e8d64c3c6c4a1cc9c08f4e38f5af