ppc: Move lbc_clk and cpu to arch_global_data

Move these fields into arch_global_data and tidy up.

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Update for bsc9132qds.c, b4860qds.c]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/arch/powerpc/cpu/mpc85xx/speed.c b/arch/powerpc/cpu/mpc85xx/speed.c
index c4ca481..f3132fb 100644
--- a/arch/powerpc/cpu/mpc85xx/speed.c
+++ b/arch/powerpc/cpu/mpc85xx/speed.c
@@ -391,7 +391,7 @@
 	gd->cpu_clk = sys_info.freqProcessor[0];
 	gd->bus_clk = sys_info.freqSystemBus;
 	gd->mem_clk = sys_info.freqDDRBus;
-	gd->lbc_clk = sys_info.freqLocalBus;
+	gd->arch.lbc_clk = sys_info.freqLocalBus;
 
 #ifdef CONFIG_QE
 	gd->qe_clk = sys_info.freqQE;