base: sync: Increase char buffer size to get accurate fence name

Increase the char buffer size for the sync fence name from
32 to 64. This makes it possible for drivers to use a longer,
more descriptive name for sync_fence, which improves the
readability of the sync dump in debugfs.

Change-Id: I8a54ec1c7b95764fe3a39f00ce392fddcfd261f1
Signed-off-by: Divya Ponnusamy <pdivya@codeaurora.org>