msm: kgsl: Initialize coresight at boot time

Initialize coresight at boot time so that it is available to be
configured before the first open of /dev/kgsl-3d0 to get GPU
scan dumps during initial power up.

Change-Id: Ic0dedbadbda251f12855895cc0aa53852f79a8b8
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>