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/b4860qds/b4860qds.c b/board/freescale/b4860qds/b4860qds.c
index 3c470db..41887c2 100644
--- a/board/freescale/b4860qds/b4860qds.c
+++ b/board/freescale/b4860qds/b4860qds.c
@@ -50,7 +50,7 @@
 {
 	char buf[64];
 	u8 sw;
-	struct cpu_type *cpu = gd->cpu;
+	struct cpu_type *cpu = gd->arch.cpu;
 	ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
 	unsigned int i;
 	static const char *const freq[] = {"100", "125", "156.25", "161.13",