emacs: revert the using elpa cscope

ELPA based cscope is not working fine due to version mismatch between
binary and emacs package. So using the emacs package which comes
with the source.

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>
emacs:yas: remove duplicate yas

Remove duplicate yas snippets that were copied previously.

Signed-off-by: Ratheesh S <ratheeshreddy@gmail.com>