hpet: remove unused writeq/readq function definitions

On all arch using hpet, only i386 miss writeq/readq.
Instead of rewriting them, use linux/io-64-nonatomic-lo-hi.h which
already have them.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Link: https://lore.kernel.org/r/20220125140352.4085290-1-clabbe@baylibre.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>