fix check for enabling exception prints
Previous change mistakenly enalbed the logs with buffered logs. The exception print is supported only when buffered logging is disabled.
Fix the check to enable logging only when buffered logs are disabled.
Signed-off-by: Nishant Sharma nishant.sharma@arm.com Change-Id: I3befd2b043a73d92e65e79e5bba0e7d8e6fd4861