coresight-etm4x: Don't set LPOVERRIDE bit when tupwr-disable is true

Don't set LPOVERRIDE bit when tupwr-disable is true to avoid the cpu hang
issue.

Change-Id: Ie12b6faa3a39e35fac1566690771321a79e99bae
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>