ColdFire:Fix the configuration broken for some boards.

Some typoes in Makefile and boards.cfg make the M54455 board
and M53017 board configuration broken.

Signed-off-by: Jason Jin <Jason.jin@freescale.com>
diff --git a/boards.cfg b/boards.cfg
index c253f03..ac9a1e6 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -279,7 +279,7 @@
 M5272C3                      m68k        mcf52x2     m5272c3             freescale
 M5275EVB                     m68k        mcf52x2     m5275evb            freescale
 M5282EVB                     m68k        mcf52x2     m5282evb            freescale
-M53017EVB                    m68k        mcf52x2     m53017evb           freescale
+M53017EVB                    m68k        mcf532x     m53017evb           freescale
 EP2500                       m68k        mcf52x2     ep2500              Mercury
 microblaze-generic           microblaze  microblaze  microblaze-generic  xilinx
 dbau1000                     mips        mips32      dbau1x00            -              au1x00      dbau1x00:DBAU1000