at91: introduce commom AT91_BASE_SYS

On all at91 except rm9200 and x40 have the System Controller starts
at address 0xffffc000 and has a size of 16KiB.

On rm9200 it's start at 0xfffe4000 of 111KiB with non reserved data starting
at 0xfffff000

This patch removes the individual definitions of AT91_BASE_SYS and
replaces them with a common version at base 0xfffffc000 and size 16KiB
and map the same memory space

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Patrice Vilchez <patrice.vilchez@atmel.com>
diff --git a/arch/arm/mach-at91/board-snapper9260.c b/arch/arm/mach-at91/board-snapper9260.c
index 3eb0a11..c600b14 100644
--- a/arch/arm/mach-at91/board-snapper9260.c
+++ b/arch/arm/mach-at91/board-snapper9260.c
@@ -42,7 +42,7 @@
 
 static void __init snapper9260_init_early(void)
 {
-	at91sam9260_initialize(18432000);
+	at91_initialize(18432000);
 
 	/* Debug on ttyS0 */
 	at91_register_uart(0, 0, 0);
@@ -179,7 +179,7 @@
 
 MACHINE_START(SNAPPER_9260, "Bluewater Systems Snapper 9260/9G20 module")
 	.timer		= &at91sam926x_timer,
-	.map_io		= at91sam9260_map_io,
+	.map_io		= at91_map_io,
 	.init_early	= snapper9260_init_early,
 	.init_irq	= snapper9260_init_irq,
 	.init_machine	= snapper9260_board_init,