net: mvneta: simplify mvneta_swbm_add_rx_fragment management

Relying on xdp frags bit, remove skb_shared_info structure
allocated on the stack in mvneta_rx_swbm routine and simplify
mvneta_swbm_add_rx_fragment accessing skb_shared_info in the
xdp_buff structure directly. There is no performance penalty in
this approach since mvneta_swbm_add_rx_fragment is run just
for xdp frags use-case.

Acked-by: Toke Hoiland-Jorgensen <[email protected]>
Acked-by: John Fastabend <[email protected]>
Signed-off-by: Lorenzo Bianconi <[email protected]>
Link: https://lore.kernel.org/r/45f050c094ccffce49d6bc5112939ed35250ba90.1642758637.git.lorenzo@kernel.org
Signed-off-by: Alexei Starovoitov <[email protected]>

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