skb: Add missing SkbConfig.h.in needed for the build.
skb: Add missing SkbConfig.h.in needed for the build.

Signed-off-by: Paul Mundt <3e0c821b08dc2f5a5c1f6861ba7f62edb7ab3d06@huawei.com>

huawei-erc/skb-core,huawei-erc/skb-core,huawei-erc/skb-core