[PARISC] Create shared <asm/ropes.h> header

Pull out struct sba_device and struct lba_device into a
common ropes.h header. Also fold the parisc portion of
iosapic.h into this file. (Then delete the useless portion
of iosapic.h)

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
diff --git a/drivers/parisc/iosapic.c b/drivers/parisc/iosapic.c
index 90489ade..c2949b4 100644
--- a/drivers/parisc/iosapic.c
+++ b/drivers/parisc/iosapic.c
@@ -146,7 +146,7 @@
 #include <asm/superio.h>
 #endif
 
-#include <asm/iosapic.h>
+#include <asm/ropes.h>
 #include "./iosapic_private.h"
 
 #define MODULE_NAME "iosapic"