ACPI: update CONFIG_ACPI_PROCFS description

Update CONFIG_ACPI_PROCFS description because the processor,
video and thermal zone procfs I/F have been removed.

Some ACPI drivers, e.g. button, have their procfs I/F always built in,
because we don't have sysfs I/F replacement at the moment.
But once we finish developing the sysfs I/F for these driver,
we need CONFIG_ACPI_PROCFS to enabled/disable the corresponding procfs I/F.

So just updating the description rather than removing this option,
although there is no procfs I/F depends on it for now.
Signed-off-by: NZhang Rui <rui.zhang@intel.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

drivers/acpi/Kconfig

@@ -51,12 +51,7 @@ config ACPI_PROCFS
 	  For backwards compatibility, this option allows
 	  deprecated /proc/acpi/ files to exist, even when
 	  they have been replaced by functions in /sys.
-	  The deprecated files (and their replacements) include:
 
-	  /proc/acpi/processor/*/throttling (/sys/class/thermal/
-		cooling_device*/*)
-	  /proc/acpi/video/*/brightness (/sys/class/backlight/)
-	  /proc/acpi/thermal_zone/*/* (/sys/class/thermal/)
 	  This option has no effect on /proc/acpi/ files
 	  and functions which do not yet exist in /sys.