arm: unify interrupt init

all arm init the IRQ stack the same way
so unify it in lib_arm/interrupts.c and then call arch specific interrupt init

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/ixp/cpu.c b/cpu/ixp/cpu.c
index 42c62f6..5cfc39d 100644
--- a/cpu/ixp/cpu.c
+++ b/cpu/ixp/cpu.c
@@ -38,10 +38,6 @@
 
 ulong loops_per_jiffy;
 
-#ifdef CONFIG_USE_IRQ
-DECLARE_GLOBAL_DATA_PTR;
-#endif
-
 static void cache_flush(void);
 
 #if defined(CONFIG_DISPLAY_CPUINFO)
@@ -81,14 +77,6 @@
 
 int cpu_init (void)
 {
-	/*
-	 * setup up stacks if necessary
-	 */
-#ifdef CONFIG_USE_IRQ
-	IRQ_STACK_START = _armboot_start - CONFIG_SYS_MALLOC_LEN - CONFIG_SYS_GBL_DATA_SIZE - 4;
-	FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
-#endif
-
 	return 0;
 }
 
diff --git a/cpu/ixp/interrupts.c b/cpu/ixp/interrupts.c
index a05e439..06a826a 100644
--- a/cpu/ixp/interrupts.c
+++ b/cpu/ixp/interrupts.c
@@ -67,7 +67,7 @@
 	IRQ_HANDLER[irq].m_func = handle_irq;
 }
 
-int interrupt_init (void)
+int arch_interrupt_init (void)
 {
 	int i;