Rename e1000_main.c to e1000.c to so we can type 'make bin/e1000.dsk' instead of...

diff --git a/src/drivers/net/e1000/e1000_main.c b/src/drivers/net/e1000/e1000.c
similarity index 100%
rename from src/drivers/net/e1000/e1000_main.c
rename to src/drivers/net/e1000/e1000.c