Revert "PCI: tegra194: Rename tegra_pcie_dw to tegra194_pcie"

This reverts commit b5725691.

Revert b5725691 ("PCI: tegra194: Rename tegra_pcie_dw to
tegra194_pcie") to keep the names of data structures generic and not
contain any one particular chip name. This is a preparatory change for the
upcoming changes that add support for Tegra234.  This has no functional
impact.

Link: https://lore.kernel.org/r/20220721142052.25971-9-vidyas@nvidia.comSigned-off-by: NVidya Sagar <vidyas@nvidia.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>