rt946x: Allow board customize initialization parameters

Currently, initialization parameters are fixed. This patch allows a
board to customize how the chip is initialized.

Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>

BUG=b/80482240
BRANCH=none
TEST=buildall

Change-Id: I0be0547d73de4d3f37e80e763efaf7840fd678c2
Reviewed-on: https://chromium-review.googlesource.com/1553564
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Nick Sanders <nsanders@chromium.org>
2 files changed