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/mx25pdk.h b/include/configs/mx25pdk.h
index 0ee8e0d..f113302 100644
--- a/include/configs/mx25pdk.h
+++ b/include/configs/mx25pdk.h
@@ -14,7 +14,7 @@
 #define CONFIG_MX25
 #define CONFIG_SYS_TEXT_BASE		0x81200000
 #define CONFIG_MXC_GPIO
-#define CONFIG_FSL_CLK
+#define CONFIG_SYS_FSL_CLK
 
 #define CONFIG_SYS_TIMER_RATE		32768
 #define CONFIG_SYS_TIMER_COUNTER	\