arm64: tegra: Add SDHCI controllers on Tegra186

Tegra186 has a total of four SDHCI controllers that each support SD 4.2
(up to UHS-I speed), SDIO 4.1 (up to UHS-I speed), eSD 2.1, eMMC 5.1 and
SDHOST 4.1 (up to UHS-I speed).

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