Rockchip: silence a debug message

Do not print a debug message with driver name on successful init.

BUG=None
TEST=veatest

Change-Id: Icd363472338bc48455a22366fa043d962d09e2ed
Reviewed-on: https://chromium-review.googlesource.com/381088


Commit-Ready: Pawel Osciak <posciak@chromium.org>
Tested-by: Pawel Osciak <posciak@chromium.org>
Reviewed-by: Kuang-che Wu <kcwu@chromium.org>