Disintegrate asm/system.h for Unicore32. (Compilation successful)
The implementation details are not changed, but only splitted.
BTW, some codestyles are adjusted.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NGuan Xuetao <gxt@mprc.pku.edu.cn>

This patch includes generic codes for memory management.
Signed-off-by: NGuan Xuetao <gxt@mprc.pku.edu.cn>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>