UPSTREAM: ASoC: rt5651: Remove unused rt5651_platform_data

There are no in tree users of platform-data for the rt5651 codec driver,
so lets remove support for it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 54e3a3a1)
Signed-off-by: Samaga Prasanna Krishna <samaga.krishna@intel.corp-partner.google.com>

BUG=b:110025789
TEST=Test Audio use cases with full SOF 0.6 rebase release series applied.

Change-Id: Ib29d9ca9dc69ac98c86987dff6dcb93b0cb453d3
Reviewed-on: https://chromium-review.googlesource.com/1353429


Commit-Ready: Curtis Malainey <cujomalainey@chromium.org>
Tested-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>