drivers: timer: add driver for ARMv7 based Tegra devices and T210

drivers: timer: add driver for ARMv7 based Tegra devices and T210

Add timer support for T20/T30/T114/T124 and T210 based devices.
Driver is based on DM, has device tree support and can be
used on SPL and early boot stage.

Arm64 Tegra (apart T210) according to comment in tegra-common.h use
architected timer.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # ASUS TF600T T30
Tested-by: Jonas Schwöbel <jonasschwoebel@yahoo.de> # Surface RT T30
Tested-by: Robert Eckelmann <longnoserob@gmail.com> # ASUS TF101 T20
Tested-by: Agneli <poczt@protonmail.ch> # Toshiba AC100 T20
Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # LG P895 T30
Co-developed-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Signed-off-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom <twarren@nvidia.com>