blackfin: bf60x: add serial support

Add serial for bf60x.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Sonic Zhang <sonic.adi@gmail.com>
diff --git a/arch/blackfin/include/asm/mach-bf561/BF561_def.h b/arch/blackfin/include/asm/mach-bf561/BF561_def.h
index 46925f8..a7ff5a3 100644
--- a/arch/blackfin/include/asm/mach-bf561/BF561_def.h
+++ b/arch/blackfin/include/asm/mach-bf561/BF561_def.h
@@ -690,6 +690,7 @@
 #define PPI1_FRAME                     0xFFC01310
 #define UART_THR                       0xFFC00400
 #define UART_RBR                       0xFFC00400
+#define UART0_RBR                      UART_RBR
 #define UART_DLL                       0xFFC00400
 #define UART_DLH                       0xFFC00404
 #define UART_IER                       0xFFC00404