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/mpc86xx/fdt.c b/arch/powerpc/cpu/mpc86xx/fdt.c
index 2f955fe9..26a65c5 100644
--- a/arch/powerpc/cpu/mpc86xx/fdt.c
+++ b/arch/powerpc/cpu/mpc86xx/fdt.c
@@ -34,10 +34,10 @@
 
 #if defined(CONFIG_MPC8641)
 	do_fixup_by_compat_u32(blob, "fsl,mpc8641-localbus",
-			       "bus-frequency", gd->lbc_clk, 1);
+			       "bus-frequency", gd->arch.lbc_clk, 1);
 #endif
 	do_fixup_by_compat_u32(blob, "fsl,elbc",
-			       "bus-frequency", gd->lbc_clk, 1);
+			       "bus-frequency", gd->arch.lbc_clk, 1);
 
 	fdt_fixup_memory(blob, (u64)bd->bi_memstart, (u64)bd->bi_memsize);