sparc64: Fix interrupt register calculations on Psycho and Sabre.

[ Upstream commit ebfb2c63 ]

Use the IMAP offset calculation for OBIO devices as documented in the
programmer's manual.  Which is "0x10000 + ((ino & 0x1f) << 3)"

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>