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/mpc7448hpc2.h b/include/configs/mpc7448hpc2.h
index be12186..497ea42 100644
--- a/include/configs/mpc7448hpc2.h
+++ b/include/configs/mpc7448hpc2.h
@@ -46,7 +46,7 @@
 #define CONFIG_IDENT_STRING	" Freescale MPC7448 HPC II"
 
 #define CONFIG_SYS_OCN_CLK		133000000	/* 133 MHz */
-#define CONFIG_SYS_CONFIG_BUS_CLK	133000000
+#define CONFIG_SYS_BUS_CLK		133000000
 
 #define CONFIG_SYS_CLK_SPREAD		/* Enable Spread-Spectrum Clock generation */