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/cpu.c b/arch/powerpc/cpu/mpc85xx/cpu.c
index 9b9832c..df2ab6d 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu.c
@@ -104,7 +104,7 @@
 		puts("CPU:   ");
 	}
 
-	cpu = gd->cpu;
+	cpu = gd->arch.cpu;
 
 	puts(cpu->name);
 	if (IS_E_PROCESSOR(svr))