common/board_f.c: change the macro name and remove it for PPC platforms

For most PPC platforms, they will call the first get_clocks() in
init_sequence_f[] as they define CONFIG_PPC. CONFIG_SYS_FSL_CLK is
then defined to call the second get_clocks(), which should be
redundant for PPC.

Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/include/configs/vf610twr.h b/include/configs/vf610twr.h
index abd1e98..a3ea2e0 100644
--- a/include/configs/vf610twr.h
+++ b/include/configs/vf610twr.h
@@ -15,7 +15,7 @@
 
 #define CONFIG_DISPLAY_CPUINFO
 #define CONFIG_DISPLAY_BOARDINFO
-#define CONFIG_FSL_CLK
+#define CONFIG_SYS_FSL_CLK
 
 #define CONFIG_MACH_TYPE		4146