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-kb9202.c b/arch/arm/mach-at91/board-kb9202.c
index a813a74..a4d8153 100644
--- a/arch/arm/mach-at91/board-kb9202.c
+++ b/arch/arm/mach-at91/board-kb9202.c
@@ -48,7 +48,7 @@
 	at91rm9200_set_type(ARCH_REVISON_9200_PQFP);
 
 	/* Initialize processor: 10 MHz crystal */
-	at91rm9200_initialize(10000000);
+	at91_initialize(10000000);
 
 	/* Set up the LEDs */
 	at91_init_leds(AT91_PIN_PC19, AT91_PIN_PC18);
@@ -140,7 +140,7 @@
 MACHINE_START(KB9200, "KB920x")
 	/* Maintainer: KwikByte, Inc. */
 	.timer		= &at91rm9200_timer,
-	.map_io		= at91rm9200_map_io,
+	.map_io		= at91_map_io,
 	.init_early	= kb9202_init_early,
 	.init_irq	= kb9202_init_irq,
 	.init_machine	= kb9202_board_init,