board/freescale/mpc8569mds/mpc8569mds.c: Fix GCC 4.6 build warning

mpc8569mds.c: In function 'local_bus_init':
mpc8569mds.c:306:7: warning: variable 'lbc_hz' set but not used [-Wunused-but-set-variable]

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

board/freescale/mpc8569mds/mpc8569mds.c

@@ -303,12 +303,10 @@ local_bus_init(void)
 	volatile fsl_lbc_t *lbc = LBC_BASE_ADDR;
 
 	uint clkdiv;
-	uint lbc_hz;
 	sys_info_t sysinfo;
 
 	get_sys_info(&sysinfo);
 	clkdiv = (lbc->lcrr & LCRR_CLKDIV) * 2;
-	lbc_hz = sysinfo.freqSystemBus / 1000000 / clkdiv;
 
 	out_be32(&gur->lbiuiplldcr1, 0x00078080);
 	if (clkdiv == 16)