Make PA-RISC use the generic interrupt handling code.  We need one tiny
change to the generic code -- the addition of a data pointer to irq_desc.
This shouldn't be a problem in terms of increasing size of irq_desc for
other architectures as the struct is cacheline aligned.  It's now 32
bytes on 32-bit platforms and 44/48 bytes on 64-bit platforms (assuming
spinlock_t is 4 bytes on 32-bit and 4 or 8 bytes on 64-bit).
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>