sfc: Explicitly prefetch RX hash prefix, not just Ethernet heade

Currently we prefetch from the Ethernet header, but we will also read
the hash prefix.  In practice they should be in the same cache line
and this won't hurt, but it is still pointless to add on the hash
prefix size.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
1 file changed