arm64: tegra: Add pinctrl definitions for pcie-ep nodes

arm64: tegra: Add pinctrl definitions for pcie-ep nodes

When the PCIe controller is running in endpoint mode, the controller
initialization is triggered by a PERST# (PCIe reset) GPIO deassertion.

The driver has configured an IRQ to trigger when the PERST# GPIO changes
state. Without the pinctrl definition, we do not get an IRQ when PERST#
is deasserted, so the PCIe controller never gets initialized.

Add the missing definitions, so that the controller actually gets
initialized.

Fixes: ec142c44b026 ("arm64: tegra: Add P2U and PCIe controller nodes to Tegra234 DT")
Fixes: 0580286d0d22 ("arm64: tegra: Add Tegra234 PCIe C4 EP definition")
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
[treding@nvidia.com: add blank lines to separate blocks]
Signed-off-by: Thierry Reding <treding@nvidia.com>