clocksource/drivers/timer-ti-dm: Fix spelling mistake "detectt" -> "detect"

There is a spelling mistake in a pr_err message. Fix it.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200519224428.6195-1-colin.king@canonical.com