UBI: Add basic UBI support to U-Boot (Part 8/8)

This patch adds basic UBI (Unsorted Block Image) support to U-Boot.
It's based on the Linux UBI version and basically has a "OS"
translation wrapper that defines most Linux specific calls
(spin_lock() etc.) into no-ops. Some source code parts have been
uncommented by "#ifdef UBI_LINUX". This makes it easier to compare
this version with the Linux version and simplifies future UBI
ports/bug-fixes from the Linux version.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/Makefile b/Makefile
index fd521b6..befb608 100644
--- a/Makefile
+++ b/Makefile
@@ -230,6 +230,7 @@
 LIBS += drivers/mtd/nand/libnand.a
 LIBS += drivers/mtd/nand_legacy/libnand_legacy.a
 LIBS += drivers/mtd/onenand/libonenand.a
+LIBS += drivers/mtd/ubi/libubi.a
 LIBS += drivers/mtd/spi/libspi_flash.a
 LIBS += drivers/net/libnet.a
 LIBS += drivers/net/phy/libphy.a