Blackfin: convert simple headers to asm-generic

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/include/asm/serial.h b/arch/blackfin/include/asm/serial.h
index 3a47606..94a4a12 100644
--- a/arch/blackfin/include/asm/serial.h
+++ b/arch/blackfin/include/asm/serial.h
@@ -1,6 +1,2 @@
-/*
- * include/asm-blackfin/serial.h
- */
-
+#include <asm-generic/serial.h>
 #define SERIAL_EXTRA_IRQ_FLAGS IRQF_TRIGGER_HIGH
-#define BASE_BAUD (1843200 / 16)