[ARM] 4196/1: S3C24XX: add S3C2410_IRQSUB() to define IRQ for sub-sources

Add a define of S3C2410_IRQSUB() to define all
the sources from the IRQSUB register, to make it
easier to work out the datasheet=>irq mappings

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>