Add LZO decompressor support

This patch adds LZO decompression support to U-Boot. It is needed for
the upcoming UBIFS support, since UBIFS uses LZO as default compressor/
decompressor. Since we only support read-only in UBIFS, only the
decompressor is needed.

All this is copied with minor changes from the current Linux kernel
version (2.6.28-rc8).

This patch only implements this LZO decompressor support for PPC.
Other platforms using UBIFS will have to add the required
"include/asm/unaligned.h" as well. It should be fairly easy to copy this
from the Linux source tree as I have done it for PPC in this patch.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/Makefile b/Makefile
index 3c9ce71..199a224 100644
--- a/Makefile
+++ b/Makefile
@@ -210,6 +210,7 @@
 
 LIBS  = lib_generic/libgeneric.a
 LIBS += lib_generic/lzma/liblzma.a
+LIBS += lib_generic/lzo/liblzo.a
 LIBS += $(shell if [ -f board/$(VENDOR)/common/Makefile ]; then echo \
 	"board/$(VENDOR)/common/lib$(VENDOR).a"; fi)
 LIBS += cpu/$(CPU)/lib$(CPU).a