setParamMaxFileDurationUs should allow zero time input as per API of setMaxDuration.

according to MediaRecorder::setMaxDuration documentation we should disable duration limit
when zero or negative time is passed. Currently setParamMaxFileDurationUs was treating
zero/negative as an error case. Fixed that.

Change-Id: I468c3bcc74cb5a34ee3e172cef5147550d6be096