tegra: dc: Fix cmu LUT1 dt parsing error

tegra: dc: Fix cmu LUT1 dt parsing error

Fix LUT1 dt parsing typecast error. While
parsing device tree data, there was a typecast to
u8 in stead of u16 fpr LUT1 values.

Bug 1644175

Change-Id: If429a789bf2e7875c6b82e0544a7b78449bdba8e
Reviewed-on: http://git-master/r/745042
(cherry picked from commit c829537319c2623c2de9c4148db7a196a6164244)
Signed-off-by: Arun Swain <arswain@nvidia.com>
Reviewed-on: http://git-master/r/748850
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
Tested-by: Jon Mayo <jmayo@nvidia.com>