Add CTR alternatives in cipher mode enums

Algorithms using the counter mode were using the term "CNTR"
in the cipher mode enums. "CTR" is more widely used, so more
enums are added replacing CNTR with CTR, leaving the previous ones
untouched, to avoid API breakages.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>