usb: host: xhci-tegra: Add Tegra234 XHCI support

This change adds Tegra234 XUSB host mode controller support.

In Tegra234, some of the registers have moved to bar2 space.
The new soc variable has_bar2 indicates the chip with bar2
area. This patch adds new reg helper to let the driver reuse
the same code for those chips with bar2 support.

Signed-off-by: Sing-Han Chen <singhanc@nvidia.com>
Co-developed-by: Wayne Chang <waynec@nvidia.com>
Signed-off-by: Wayne Chang <waynec@nvidia.com>
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/20230111110450.24617-7-jonathanh@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>