common: board_r: Drop arch-specific ifdefs around initr_trap

In order to remove the arch-specific ifdefs around initr_trap, introduce
arch_initr_trap weak initcall. Implementations for ppc/m68k/mips have
been moved to arch/<arch>/lib/traps.c

Default implementation is a nop stub.

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/m68k/lib/traps.c b/arch/m68k/lib/traps.c
index c49141f..0c2c1a9 100644
--- a/arch/m68k/lib/traps.c
+++ b/arch/m68k/lib/traps.c
@@ -40,7 +40,7 @@
 	for(;;);
 }
 
-void trap_init(ulong value) {
+static void trap_init(ulong value) {
 	unsigned long *vec = (ulong *)value;
 	int i;
 
@@ -59,3 +59,10 @@
 
 	setvbr(value);		/* set vector base register to new table */
 }
+
+int arch_initr_trap(void)
+{
+	trap_init(CONFIG_SYS_SDRAM_BASE);
+
+	return 0;
+}