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-stamp9g20.c b/arch/arm/mach-at91/board-stamp9g20.c
index 5e5c856..e65efda 100644
--- a/arch/arm/mach-at91/board-stamp9g20.c
+++ b/arch/arm/mach-at91/board-stamp9g20.c
@@ -35,7 +35,7 @@
 void __init stamp9g20_init_early(void)
 {
 	/* Initialize processor: 18.432 MHz crystal */
-	at91sam9260_initialize(18432000);
+	at91_initialize(18432000);
 
 	/* DGBU on ttyS0. (Rx & Tx only) */
 	at91_register_uart(0, 0, 0);
@@ -299,7 +299,7 @@
 MACHINE_START(PORTUXG20, "taskit PortuxG20")
 	/* Maintainer: taskit GmbH */
 	.timer		= &at91sam926x_timer,
-	.map_io		= at91sam9260_map_io,
+	.map_io		= at91_map_io,
 	.init_early	= portuxg20_init_early,
 	.init_irq	= init_irq,
 	.init_machine	= portuxg20_board_init,
@@ -308,7 +308,7 @@
 MACHINE_START(STAMP9G20, "taskit Stamp9G20")
 	/* Maintainer: taskit GmbH */
 	.timer		= &at91sam926x_timer,
-	.map_io		= at91sam9260_map_io,
+	.map_io		= at91_map_io,
 	.init_early	= stamp9g20evb_init_early,
 	.init_irq	= init_irq,
 	.init_machine	= stamp9g20evb_board_init,