Tegra124 SoC SATA AHCI controller

Required properties :
- compatible : "nvidia,tegra124-ahci".
- reg : Should contain 2 entries:
  - AHCI register set (SATA BAR5)
  - SATA register set
- interrupts : Defines the interrupt used by SATA
- clocks : Must contain an entry for each entry in clock-names.
  See ../clocks/clock-bindings.txt for details.
- clock-names : Must include the following entries:
  - sata
  - sata-oob
  - cml1
  - pll_e
- resets : Must contain an entry for each entry in reset-names.
  See ../reset/reset.txt for details.
- reset-names : Must include the following entries:
  - sata
  - sata-oob
  - sata-cold
- phys : Must contain an entry for each entry in phy-names.
  See ../phy/phy-bindings.txt for details.
- phy-names : Must include the following entries:
  - sata-phy : XUSB PADCTL SATA PHY
- hvdd-supply : Defines the SATA HVDD regulator
- vddio-supply : Defines the SATA VDDIO regulator
- avdd-supply : Defines the SATA AVDD regulator
- target-5v-supply : Defines the SATA 5V power regulator
- target-12v-supply : Defines the SATA 12V power regulator

Add NVIDIA Tegra SATA controller binding
of: Add NVIDIA Tegra SATA controller binding

This patch adds device tree binding documentation for the SATA
controller found on NVIDIA Tegra SoCs.

Signed-off-by: Mikko Perttunen <4d1e97e91f33be8fb70fd1f552f766fdcea04bd3@nvidia.com>
Acked-by: Hans de Goede <9fa1be1a5b5729e4c6b404f34c9ce49ff4882fd8@redhat.com>
Signed-off-by: Tejun Heo <546b05909706652891a87f7bfe385ae147f61f91@kernel.org>
