powerpc/ppc4xx: Remove CONFIG_SYS_FLASH_PROTECTION from gdsys boards

CONFIG_SYS_FLASH_PROTECTION was active on most gdsys boards by default,
while hardware flash protection was not implemented.
Hardware support was added recently and we get into trouble because backward
compatibility is broken (u-boot can't unprotect the protected flash after a
downgrade). So we decided to disable hardware flash protection for all our boards.

Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/configs/io.h b/include/configs/io.h
index 27d1b0f..79ada68 100644
--- a/include/configs/io.h
+++ b/include/configs/io.h
@@ -18,7 +18,7 @@
  * Include common defines/options for all AMCC eval boards
  */
 #define CONFIG_HOSTNAME		io
-#define CONFIG_IDENT_STRING	" io 0.05"
+#define CONFIG_IDENT_STRING	" io 0.06"
 #include "amcc-common.h"
 
 #define CONFIG_BOARD_EARLY_INIT_F
@@ -123,7 +123,6 @@
 #define CONFIG_SYS_FLASH_WRITE_TOUT	500	/* Timeout for Flash Write/ms */
 
 #define CONFIG_SYS_FLASH_USE_BUFFER_WRITE 1	/* use buff'd writes */
-#define CONFIG_SYS_FLASH_PROTECTION	1	/* use hardware flash protect */
 
 #define CONFIG_SYS_FLASH_EMPTY_INFO	/* 'E' for empty sector on flinfo */
 #define CONFIG_SYS_FLASH_QUIET_TEST	1	/* no warn upon unknown flash */