[PARISC] Convert soft power switch driver to kthread

And remove it's reference in time.c.
Allow lcd_print() to take a const char *.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
diff --git a/drivers/parisc/led.c b/drivers/parisc/led.c
index 6818c10..a415d9b 100644
--- a/drivers/parisc/led.c
+++ b/drivers/parisc/led.c
@@ -631,7 +631,7 @@
    ** avoid a race condition while writing the CMD/DATA register pair.
    **
  */
-int lcd_print( char *str )
+int lcd_print( const char *str )
 {
 	int i;