vim: Rework things so vim adds features not vim-tiny removes

vim: Rework things so vim adds features not vim-tiny removes

Now that we have a common inc file for both vim and vim-tiny move a few
bits of logic out of vim.inc and in to vim_$VER.bb so that vim adds
things rather than vim-tiny removes them.

Suggested-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>