forked from Mirrors/opensbi

We add simple bitmap library which will help us create and maintain bitmaps. It will also help us create a simple HART mask library. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>