ACPI: add a Kconfig option for ACPI procfs interface

Add a kconfig option CONFIG_ACPI_PROCFS to make procfs interface
a configurable attribute of ACPI.

No procfs interface is actually deprecated,
and no sysfs interface is added in this patch.

CONGI_ACPI_PROCFS is used to mark procfs interface as deprecated
once the same function is duplicated in sysfs.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 30f3c8c..9bc3752 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -256,3 +256,12 @@
 Who:	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
 
 ---------------------------
+
+What:	ACPI procfs interface
+When:	July 2007
+Why:	After ACPI sysfs conversion, ACPI attributes will be duplicated
+	in sysfs and the ACPI procfs interface should be removed.
+Who:	Zhang Rui <rui.zhang@intel.com>
+
+---------------------------
+