armv7: integrate cache maintenance support

- Enable I-cache on bootup
- Enable MMU and D-cache immediately after relocation
	- Do necessary initialization before enabling d-cache and MMU
- Changes to cleanup_before_linux()
	- Make changes according to the new framework

Signed-off-by: Aneesh V <aneesh@ti.com>
diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index 4f88f58..fc52a26 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -450,6 +450,12 @@
 	gd->flags |= GD_FLG_RELOC;	/* tell others: relocation done */
 
 	monitor_flash_len = _end_ofs;
+	/*
+	 * Enable D$:
+	 * I$, if needed, must be already enabled in start.S
+	 */
+	dcache_enable();
+
 	debug ("monitor flash len: %08lX\n", monitor_flash_len);
 	board_init();	/* Setup chipselects */