PM/Hibernate: Move NVS routines into a seperate file (v2).

The *_nvs_* routines in swsusp.c make use of the io*map()
functions, which are only provided for HAS_IOMEM, thus
breaking compilation if HAS_IOMEM is not set. Fix this
by moving the *_nvs_* routines into hibernate_nvs.c, which
is only compiled if HAS_IOMEM is set.

[rjw: Change the name of the new file to hibernate_nvs.c, add the
 license line to the header comment.]

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 23bd4da..72067cb 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -116,9 +116,13 @@
 
 	  Turning OFF this setting is NOT recommended! If in doubt, say Y.
 
+config HIBERNATION_NVS
+	bool
+
 config HIBERNATION
 	bool "Hibernation (aka 'suspend to disk')"
 	depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
+	select HIBERNATION_NVS if HAS_IOMEM
 	---help---
 	  Enable the suspend to disk (STD) functionality, which is usually
 	  called "hibernation" in user interfaces.  STD checkpoints the