malloc: adjust memcpy() and memset() definitions.

Compiling the sandbox fails on armv7 due to conflicting definitions of
memcpy() and memset() in include/malloc.h and include/linux/string.h.

Use linux/string.h here.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed