crypto: crc32: Optimize dynamic CRC table generation ...

In barebox we have an option for dynamic formation of the CRC32
table (DYNAMIC_CRC_TABLE), but the source code declares a static
array which is simply filled with data, the resulting code becomes
even more than without DYNAMIC_CRC_TABLE option, due to the BSS usage.
CONFIG_DYNAMIC_CRC_TABLE=n
   text    data     bss     dec     hex filename
   1884       0       0    1884     75c crc32.o
CONFIG_DYNAMIC_CRC_TABLE=y
   text    data     bss     dec     hex filename
   1066       4    1024    2094     82e crc32.o

This patch provides dynamic buffer allocation for the CRC table,
which saves about 1 Kbyte, as it should be.
CONFIG_DYNAMIC_CRC_TABLE=y
   text    data     bss     dec     hex filename
   1062       0       4    1066     42a crc32.o

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

include: move crc specific stuff to crc.h ...

We have a crc.h, so move our crc function prototypes there to further
cleanup common.h.

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

crypto: crc32: fix warnings: no previous prototype for 'crc32', 'crc32_no_comp', 'file_crc' ...

Signed-off-by: Sergey Koshechkin <serge.koshechkin@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

scripts: bareboxcrc32 as host and target userspacetool ...

This patch adds the crc32 command to be build
as host and optionally as target tool.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

move digest to crypto/ ...

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