OMAP3: Add SPL_BOARD_INIT hook

Add an SPL_BOARD_INIT hook and for OMAP3 have it turn on i2c.  OMAP4
doesn't need i2c enabled in SPL.  Enable SPL_BOARD_INIT on devkit8000.

Cc: Frederik Kriewitz <frederik@kriewitz.eu>
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/arch/arm/cpu/armv7/omap-common/spl.c b/arch/arm/cpu/armv7/omap-common/spl.c
index f72d389..25f04ed 100644
--- a/arch/arm/cpu/armv7/omap-common/spl.c
+++ b/arch/arm/cpu/armv7/omap-common/spl.c
@@ -116,6 +116,10 @@
 
 	timer_init();
 
+#ifdef CONFIG_SPL_BOARD_INIT
+	spl_board_init();
+#endif
+
 	boot_device = omap_boot_device();
 	debug("boot device - %d\n", boot_device);
 	switch (boot_device) {