[PARISC] Add __read_mostly section for parisc

Flag a whole bunch of things as __read_mostly on parisc. Also flag a few
branches as unlikely() and cleanup a bit of code.

Signed-off-by: Helge Deller <deller@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
diff --git a/drivers/parisc/lasi.c b/drivers/parisc/lasi.c
index a8c2039..2b3ba1d 100644
--- a/drivers/parisc/lasi.c
+++ b/drivers/parisc/lasi.c
@@ -150,7 +150,7 @@
  * 
  */
 
-static unsigned long lasi_power_off_hpa;
+static unsigned long lasi_power_off_hpa __read_mostly;
 
 static void lasi_power_off(void)
 {