drivers/net/*.c: Use static const

Using static const generally increases object text and decreases data size.
It also generally decreases overall object size.

Signed-off-by: Joe Perches <joe@perches.com>

diff --cc drivers/net/3c501.c
Simple merge

diff --cc drivers/net/3c503.c
Simple merge

diff --cc drivers/net/3c507.c
Simple merge

diff --cc drivers/net/3c527.c
Simple merge

diff --cc drivers/net/at1700.c
Simple merge

diff --cc drivers/net/bnx2.c
Simple merge

diff --cc drivers/net/e2100.c
Simple merge

diff --cc drivers/net/eepro.c
Simple merge

diff --cc drivers/net/eexpress.c
Simple merge

diff --cc drivers/net/gianfar.c
Simple merge

diff --cc drivers/net/hp.c
Simple merge

diff --cc drivers/net/jme.c
Simple merge

diff --cc drivers/net/ksz884x.c
Simple merge

diff --cc drivers/net/ni52.c
Simple merge

diff --cc drivers/net/ni65.c
Simple merge

diff --cc drivers/net/r8169.c
Simple merge

diff --cc drivers/net/skge.c
Simple merge

diff --cc drivers/net/smc-ultra.c
Simple merge

diff --cc drivers/net/wd.c
Simple merge