ppc: Move CONFIG_QE to arch_global_data

Move the quantative easing fields into arch_global_data and tidy up.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/powerpc/cpu/mpc85xx/speed.c b/arch/powerpc/cpu/mpc85xx/speed.c
index 81c80e7..7173c07 100644
--- a/arch/powerpc/cpu/mpc85xx/speed.c
+++ b/arch/powerpc/cpu/mpc85xx/speed.c
@@ -394,8 +394,8 @@
 	gd->arch.lbc_clk = sys_info.freqLocalBus;
 
 #ifdef CONFIG_QE
-	gd->qe_clk = sys_info.freqQE;
-	gd->arch.brg_clk = gd->qe_clk / 2;
+	gd->arch.qe_clk = sys_info.freqQE;
+	gd->arch.brg_clk = gd->arch.qe_clk / 2;
 #endif
 	/*
 	 * The base clock for I2C depends on the actual SOC.  Unfortunately,