efl: Remove cserve2 support from Makefile_Evas.am

Summary:
ref T7226
Depends on D6938

Reviewers: raster, cedric, zmike, Hermet

Reviewed By: Hermet

Subscribers: reviewers, committers

Tags: efl

Maniphest Tasks: T7226

Differential Revision: https://phab.enlightenment.org/D6939