Don't include option_table.h every time we include mc146818rtc.h, that was a

Don't include option_table.h every time we include mc146818rtc.h, that was a
stupid idea. Instead include it where it is needed. And add some explicit
dependencies to it.

Also, error for missing IRQ_SLOT_COUNT for now, so we can fix up the boards.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5321 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1