pbl: Implement strrchr ...

strrchr is needed for libfdt. Add support for it to the pbl.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

PBL: Add strnlen, needed for printf support ...

vsprintf needs strnlen, so in oder to add console support to
the PBL we need a strnlen implementation.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pbl string: Fix no previous prototype warnings ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add pre-bootloader (pbl) image support ...

This allows for creating a pre-bootloader binary for
 - nand boot
 - mmc boot
 - compressed image

The pbl will be incharge of the lowlevel init if needed.
The barebox will skip it.

Import string functions from linux 3.4 (arch/arm/boot/compressed/string.c) and
implement a dummy panic.

For now on introduce dummy zbarebox* targets and c code that will contain later
the decompressor. This only implemeted on ARM.

This patch is based on Sascha Hauer <s.hauer@pengutronix.de>
Add compressed image support patch

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>