[ns8390] Use stub files instead of src/Config

ns8390.c can produce four different drivers (one PCI, three ISA.)  The
ISA driver requires setting a few macros; do that by setting defines
in stub files instead of using src/Config.

Currently, all the ISA drivers are broken (they were not enabled by
default), so #if 0 them out.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

src/Config

 #			  address by one (0x300 -> 0x301) will force a
 #			  more aggressive probing algorithm. This might
 #			  be neccessary after a soft-reset of the NIC.
-
-
-CFLAGS_3c503	= -DINCLUDE_3C503 # -DT503_SHMEM
-CFLAGS_ne	= -DINCLUDE_NE -DNE_SCAN=0x300,0x280,0x320,0x340,0x380
-CFLAGS_ns8390	= -DINCLUDE_NS8390	# NE2000/PCI!
-CFLAGS_wd	= -DINCLUDE_WD -DWD_DEFAULT_MEM=0xCC000

src/drivers/net/3c503.c

+/* 3Com 3c503, a memory-mapped NS8390-based card */
+#if 0 /* Currently broken! */
+#define INCLUDE_3C503
+#include "ns8390.c"
+#endif

src/drivers/net/ne.c

+/* ISA I/O mapped NS8390-based cards, including NE2000 */
+#if 0 /* Currently broken! */
+#define INCLUDE_NE 1
+#define NE_SCAN 0x300,0x280,0x320,0x340,0x380
+#include "ns8390.c"
+#endif

src/drivers/net/ns8390.c

 
 #if 1
 
+#if !defined(INCLUDE_NS8390) && !defined(INCLUDE_WD) && \
+    !defined(INCLUDE_NE) && !defined(INCLUDE_3C503)
+  /* The driver named ns8390 is the PCI driver, often called
+     "PCI ne2000 clones". */
+# define INCLUDE_NS8390 1
+#endif
 
 #include "etherboot.h"
 #include "nic.h"

src/drivers/net/wd.c

+/* ISA memory-mapped NS8390-based cards, including WD80x3 */
+#if 0 /* Currently broken! */
+#define INCLUDE_WD
+#define WD_DEFAULT_MEM 0xCC000
+#include "ns8390.c"
+#endif