coresight: replace dev_info() with dev_dbg() from driver probe()

Currently, coresight drivers are logging a dev_info() message in
probe() function for each device. This logging spew could fill up
kernel log buffer quickly pushing useful information out of log
buffer (particularly when target supports multiple coresight
devices of same type). Replace this logging with dev_dbg() from
coresight drivers to make kernel logs less verbose.

Change-Id: I7f7659fc39d1634a10274bf7df310a6edd1ec9e1
Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org>