always enable periodic TRIM

fstrim will quietly skip unsupported drives. Removing the check
here allows us to avoid the problem of figuring out if `/dev/sda` is
actually the correct device to be looking at.

roles/ssd/tasks/main.yml

@@ -2,11 +2,5 @@
 - name: Install hdparm
   pacman: name=hdparm state=present
 
-- name: Check for TRIM support
-  shell: "hdparm -I /dev/sda | grep TRIM"
-  register: hdparm
-  ignore_errors: True
-
 - name: Enable and start weekly filesystem TRIM timer
   service: name=fstrim.timer enabled=yes state=started
-  when: "hdparm.rc == 0"