Disable Encoding cop for now

the cop forces UTF-8 comment for all files (even with only ASCII
characters) - will try to improve this in rubocop and then the cop can
be reenabled

Change-Id: Ie072ea84167ee25adb6fa9115e15786d7a79e936
Reviewed-on: http://gerrit.causes.com/37456
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>