chelsio cxgb/cxgb3: Make stats_strings arrays const

Move ~2KB of strings in each driver from data to text.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/chelsio/cxgb/cxgb2.c
Simple merge

diff --cc drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
Simple merge