arm64: tegra: Select PM_GENERIC_DOMAINS

Enable PM_GENERIC_DOMAINS for 64-bit Tegra devices. This is required to
ensure that devices dependent upon a particular power domain are probed
only after that power domain has been powered up.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>