Blackfin: convert BFIN_CPU to CONFIG_BFIN_CPU

Stop tying things to the processor that should be tied to other defines and
change BFIN_CPU to CONFIG_BFIN_CPU so that it can be used in the build
system to select the -mcpu option.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/lib_blackfin/board.c b/lib_blackfin/board.c
index 86a3b67..2a5a2fc 100644
--- a/lib_blackfin/board.c
+++ b/lib_blackfin/board.c
@@ -116,6 +116,7 @@
 {
 	sprintf(version_string, VERSION_STRING_FORMAT, VERSION_STRING);
 	printf("%s\n", version_string);
+	printf("CPU:   ADSP " MK_STR(CONFIG_BFIN_CPU) " (Detected Rev: 0.%d)\n", bfin_revid());
 	return (0);
 }
 
@@ -404,7 +405,7 @@
 	misc_init_r();
 #endif
 
-#if ((BFIN_CPU == ADSP_BF537) || (BFIN_CPU == ADSP_BF536))
+#ifdef CONFIG_CMD_NET
 	printf("Net:    ");
 	eth_initialize(bd);
 #endif