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/board/Marvell/db64360/sdram_init.c b/board/Marvell/db64360/sdram_init.c
index d0817d7..d52d3f0 100644
--- a/board/Marvell/db64360/sdram_init.c
+++ b/board/Marvell/db64360/sdram_init.c
@@ -1290,37 +1290,37 @@
 	case 0x0:
 	case 0x80:		/* refresh period is 15.625 usec */
 		sdram_config_reg =
-			(unsigned int) (((float) 15.625 * (float) CONFIG_SYS_BUS_HZ)
+			(unsigned int) (((float) 15.625 * (float) CONFIG_SYS_BUS_CLK)
 					/ (float) 1000000.0);
 		break;
 	case 0x1:
 	case 0x81:		/* refresh period is 3.9 usec */
 		sdram_config_reg =
-			(unsigned int) (((float) 3.9 * (float) CONFIG_SYS_BUS_HZ) /
+			(unsigned int) (((float) 3.9 * (float) CONFIG_SYS_BUS_CLK) /
 					(float) 1000000.0);
 		break;
 	case 0x2:
 	case 0x82:		/* refresh period is 7.8 usec */
 		sdram_config_reg =
-			(unsigned int) (((float) 7.8 * (float) CONFIG_SYS_BUS_HZ) /
+			(unsigned int) (((float) 7.8 * (float) CONFIG_SYS_BUS_CLK) /
 					(float) 1000000.0);
 		break;
 	case 0x3:
 	case 0x83:		/* refresh period is 31.3 usec */
 		sdram_config_reg =
-			(unsigned int) (((float) 31.3 * (float) CONFIG_SYS_BUS_HZ) /
+			(unsigned int) (((float) 31.3 * (float) CONFIG_SYS_BUS_CLK) /
 					(float) 1000000.0);
 		break;
 	case 0x4:
 	case 0x84:		/* refresh period is 62.5 usec */
 		sdram_config_reg =
-			(unsigned int) (((float) 62.5 * (float) CONFIG_SYS_BUS_HZ) /
+			(unsigned int) (((float) 62.5 * (float) CONFIG_SYS_BUS_CLK) /
 					(float) 1000000.0);
 		break;
 	case 0x5:
 	case 0x85:		/* refresh period is 125 usec */
 		sdram_config_reg =
-			(unsigned int) (((float) 125 * (float) CONFIG_SYS_BUS_HZ) /
+			(unsigned int) (((float) 125 * (float) CONFIG_SYS_BUS_CLK) /
 					(float) 1000000.0);
 		break;
 	default:		/* refresh period undefined */