ppc: Move reset_status to arch_global_data

Move this field into arch_global_data and tidy up.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/powerpc/cpu/mpc83xx/cpu_init.c b/arch/powerpc/cpu/mpc83xx/cpu_init.c
index 20d0600..9325110 100644
--- a/arch/powerpc/cpu/mpc83xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc83xx/cpu_init.c
@@ -232,7 +232,7 @@
 	clrsetbits_be32(&im->clk.sccr, sccr_mask, sccr_val);
 
 	/* RSR - Reset Status Register - clear all status (4.6.1.3) */
-	gd->reset_status = __raw_readl(&im->reset.rsr);
+	gd->arch.reset_status = __raw_readl(&im->reset.rsr);
 	__raw_writel(~(RSR_RES), &im->reset.rsr);
 
 	/* AER - Arbiter Event Register - store status */
@@ -499,7 +499,7 @@
 		RSR_HRS,  "External/Internal Hard"}
 	};
 	static int n = sizeof bits / sizeof bits[0];
-	ulong rsr = gd->reset_status;
+	ulong rsr = gd->arch.reset_status;
 	int i;
 	char *sep;