vendor: cleanup

common.mk:
* Fix witespace issue
* 'windowsmgr.max_events_per_sec' does not exist in source
  anymore.

Removed ThinkFree as it hasn't been used for a while as far as I can tell.

Sources:

http://forum.xda-developers.com/showthread.php?t=2544330
jgrep on the source

Change-Id: Icce1029faa045daa4e79416d6f4c35879f55fcd4