ARM: tegra: tn8 : update power rail accordingly

ARM: tegra: tn8 : update power rail accordingly

- Update rails - pwrdet, hdmi, backlight and ddr.
- Add smps45 constraint for vdd_gpu.
- Disable roof_floor for smps45 since external gpio control is not ready in gpu init path.
- Correct init_mode for smps10 and ldo8

Bug 1313128

Change-Id: I7f3c8cdd3b75353e008e676ff399242e1203b4ca
Signed-off-by: Ahung Cheng <ahcheng@nvidia.com>
Reviewed-on: http://git-master/r/250549
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>