rtc-pcf8583 build fix

Fix bogus #include in rtc-pcf8583, so it compiles on platforms that
don't support PC clone RTCs.  (Original issue noted by Adrian Bunk.)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: Adrian Bunk <bunk@kernel.org>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>