coresight: csr: Set EOT on periodic flush

Set EOT on periodic flush for lagoon long periodic flush time issue
workaround. It could make USB flush in low rate not see a big
lantency.

Change-Id: I768fb04317b184212ccae4e2912b5c538ac970de
Signed-off-by: Tao,Zhang <taozha@codeaurora.org>