Get rid of bogus CONFIG_SYS_BUS_HZ and CONFIG_SYS_CONFIG_BUS_CLK definitions

CONFIG_SYS_BUS_HZ has not really been used anywhere except to be
redined as CONFIG_SYS_BUS_CLK; in addition, the mpc7448hpc2 had the
bogus CONFIG_SYS_CONFIG_BUS_CLK setting which duplicated the
funtionality.  Change all this to use CONFIG_SYS_BUS_CLK consistently.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Frank Gottschling <fgottschling@eltec.de>
Cc: Reinhard Arlt <reinhard.arlt@esd-electronics.com>
Cc: Eran Man <eran@nbase.co.il>
Cc: Stefan Roese <sr@denx.de>
Cc: Nye Liu <nyet@zumanetworks.com>
Cc: Roy Zang <tie-fei.zang@freescale.com>
diff --git a/include/configs/ppmc7xx.h b/include/configs/ppmc7xx.h
index 0fd8635..04779c4 100644
--- a/include/configs/ppmc7xx.h
+++ b/include/configs/ppmc7xx.h
@@ -355,12 +355,10 @@
 /*
  * Clocks config
  *
- * CONFIG_SYS_BUS_HZ			- Bus clock frequency in Hz
- * CONFIG_SYS_BUS_CLK			- As above (?)
+ * CONFIG_SYS_BUS_CLK			- Bus clock frequency in Hz
  * CONFIG_SYS_HZ			- Decrementer freq in Hz
  */
 
-#define CONFIG_SYS_BUS_HZ		CONFIG_BUS_CLK
 #define CONFIG_SYS_BUS_CLK		CONFIG_BUS_CLK
 #define CONFIG_SYS_HZ			1000