i2c-tegra: Use struct dev_pm_ops for power management

Make the Tegra I2C controller driver define its PM callbacks through
a struct dev_pm_ops object rather than by using legacy PM hooks
in struct platform_driver.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
[wsa] adapt to of_match_ptr change

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>