drivers/rtc/rtc-hym8563.c: staticize local symbol

'hym8563_clkout_ops' is used only in this file.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>