ARM: at91: add ioremap_registers entry point to soc setup

this will allow to ioremap the register of the PIT, PMC and others
and make the code soc independent

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/mach-at91/setup.c b/arch/arm/mach-at91/setup.c
index aa64294..63b3ac2 100644
--- a/arch/arm/mach-at91/setup.c
+++ b/arch/arm/mach-at91/setup.c
@@ -287,6 +287,8 @@
 
 void __init at91_initialize(unsigned long main_clock)
 {
+	at91_boot_soc.ioremap_registers();
+
 	/* Init clock subsystem */
 	at91_clock_init(main_clock);