clocksource/drivers/sun5i: Remove unnecessary (void*) conversions

Remove unnecessary void* type castings.

Signed-off-by: Li zeming <zeming@nfschina.com>
Link: https://lore.kernel.org/r/20220727083751.5540-1-zeming@nfschina.com


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>