coresight: disable ETM probe for Krait pass3.

Memory mapped accesses to ETM registers on Krait pass3 cause
intermittent hangs that lock up all the Kraits and their T32
sessions.

This is currently under debug but until this is resolved
error out of ETM probe for Krait pass3.

Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
Signed-off-by: Joel King <joelking@codeaurora.org>
(cherry picked from commit 670627c3)

Change-Id: I563451964ae5b5afd72423c1a2cec391edc6142e
Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>