Revert "temporarily remove COPYING.LGPLv3"
This reverts commit
af05a233a7c72a42287b4f267d1a5bc3c8a76603.
Move files from libreriscv.git/openpower/sv/bitmanip/
https://git.libre-soc.org/?p=libreriscv.git;a=tree;f=openpower/sv/bitmanip;hb=
633d57457d98b8c6ab7803fe72050f8918bba87f