drivers/clocksource/arm_arch_timer: Remove duplicate error message

The function acpi_gtdt_init() prints a message in case of
error. Remove the error message after testing if the function fails,
otherwise it is a duplicate message.

Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200429153559.21189-1-zhengdejin5@gmail.com