thunderbolt: Use 32-bit writes when writing ring producer/consumer

[ Upstream commit 943795219d3cb9f8ce6ce51cad3ffe1f61e95c6b ]

The register access should be using 32-bit reads/writes according to the
datasheet. With the previous generation hardware 16-bit writes have been
working but starting with ICL this is not the case anymore so fix
producer/consumer register update to use correct width register address.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Tested-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>