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/board/freescale/p1010rdb/p1010rdb.c b/board/freescale/p1010rdb/p1010rdb.c
index dfeb86f..11e2e8a 100644
--- a/board/freescale/p1010rdb/p1010rdb.c
+++ b/board/freescale/p1010rdb/p1010rdb.c
@@ -164,7 +164,7 @@
 {
 	struct cpu_type *cpu;
 
-	cpu = gd->cpu;
+	cpu = gd->arch.cpu;
 	printf("Board: %sRDB\n", cpu->name);
 
 	return 0;
@@ -178,7 +178,7 @@
 	struct cpu_type *cpu;
 	int num = 0;
 
-	cpu = gd->cpu;
+	cpu = gd->arch.cpu;
 
 #ifdef CONFIG_TSEC1
 	SET_STD_TSEC_INFO(tsec_info[num], 1);
@@ -283,7 +283,7 @@
 	phys_size_t size;
 	struct cpu_type *cpu;
 
-	cpu = gd->cpu;
+	cpu = gd->arch.cpu;
 
 	ft_cpu_setup(blob, bd);