this will all to simplify the sync with the kernel and later easly add the
self decompression support to barebox

as example with a lzo compression will reduce barebox from 180224 to 99863
bytes so 55.41%
-rwxr-xr-x 1 root root  99863 Jan 28 02:17 build/versatilepb/barebox.bin.lzo

we also reduce the binary size by 224 bytes

Old version
# ls -al build/versatilepb/barebox.bin
-rwxr-xr-x 1 root root 180468 Jan 28 02:14 build/versatilepb/barebox.bin

New version
# ls -al build/versatilepb/barebox*
-rwxr-xr-x 1 root root 180244 Jan 28 02:13 build/versatilepb/barebox.bin

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>