dt-bindings: Document Tegra234 HDA support

Update binding document for HDA support on Tegra234 chip.

Tegra234 has max of 2 clocks and 2 resets which requires to add
minItems and maxItems for clocks and resets as Tegra chips can
now have minimum of 2 and maximum of 3 clocks and reset support.

Signed-off-by: Mohan Kumar <mkumard@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>