dm9601: fix reception of full size ethernet frames on dm9620/dm9621a

commit 407900cfb54bdb2cfa228010b6697305f66b2948 upstream.

dm9620/dm9621a require room for 4 byte padding even in dm9601 (3 byte
header) mode.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>