sonypi - Move sonypi.txt to Documentation/laptops

Also update references to sonypi.txt in Kconfig.

Signed-off-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
CC: Mattia Dongili <malattia@linux.it>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index f01ac9a..47c6be8 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -875,7 +875,7 @@
 	  Device which can be found in many (all ?) Sony Vaio laptops.
 
 	  If you have one of those laptops, read
-	  <file:Documentation/sonypi.txt>, and say Y or M here.
+	  <file:Documentation/laptops/sonypi.txt>, and say Y or M here.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called sonypi.