broadcom: Mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.

This patch fixes the following warnings:

drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c:6336:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c:2231:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
drivers/net/ethernet/broadcom/tg3.c:722:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
drivers/net/ethernet/broadcom/tg3.c:783:6: warning: this statement may fall through [-Wimplicit-fallthrough=]

Warning level 3 was used: -Wimplicit-fallthrough=3

This patch is part of the ongoing efforts to enabling
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Sudarsana Kalluru <Sudarsana.Kalluru@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>