clocksource/drivers/imx: Add support for i.MX TPM driver with ARM64

Allows building and compile-testing the i.MX TPM driver for ARM64.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1594178168-13007-1-git-send-email-Anson.Huang@nxp.com