This patch removes the inclusion of libgcc functions into Barebox on the ARM
architecture. Only the really needed functions are provided in the lib_arm
directory. Those implementations are copied from Linux where they are well
proven related to reliably, performance.

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