arch/arc: Move fatal_error.c into 'core'

One of many steps in the transform BSPs to platforms work item.  At the end
of this work item, there should not be any code in the 'arch/arc' directory.

Change-Id: If72a6a858eb4b0f1521191fca441bed4acc6d8ce
Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>

arch/arc/Makefile

@@ -3,7 +3,6 @@ asflags-y +=-I$(srctree)/arch/arc/$(strip $(CONFIG_PLATFORM))
 
 obj-y = core/
 
-obj-y += fatal_error.o \
-         prep_c.o \
+obj-y += prep_c.o \
          reset.o \
          vector_table.o

arch/arc/core/Makefile

@@ -4,4 +4,5 @@ ccflags-y += -I$(srctree)/kernel/microkernel/include
 obj-y += atomic.o context.o context_wrapper.o \
 	cpu_idle.o  fast_irq.o  fatal.o  fault.o  \
 	fault_s.o  ffs.o  irq_lock.o  irq_manage.o  \
-	isr_wrapper.o  regular_irq.o  swap_macros.h  swap.o
+	isr_wrapper.o  regular_irq.o  swap_macros.h  swap.o \
+	sys_fatal_error_handler.o

arch/arc/core/sys_fatal_error_handler.c

@@ -38,7 +38,6 @@ This module provides the _SysFatalErrorHandler() routine for ARCv2 BSPs.
 #include <nanokernel.h>
 #include <toolchain.h>
 #include <sections.h>
-#include "board.h"
 
 #ifdef CONFIG_PRINTK
 #include <misc/printk.h>