ACPI: remove CONFIG_ACPI_SYSTEM

Remove CONFIG_ACPI_SYSTEM.  It was always set the same as CONFIG_ACPI,
and it had no menu label, so there was no way to set it to anything
other than "y".

Some things under CONFIG_ACPI_SYSTEM (acpi_irq_handled, acpi_os_gpe_count(),
event_is_open, register_acpi_notifier(), etc.) are used unconditionally
by the CA, the OSPM, and drivers, so we depend on them always being
present.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/Kconfig

@@ -254,13 +254,6 @@ config ACPI_PCI_SLOT
 	  help you correlate PCI bus addresses with the physical geography
 	  of your slots. If you are unsure, say N.
 
-config ACPI_SYSTEM
-	bool
-	default y
-	help
-	  This driver will enable your system to shut down using ACPI, and
-	  dump your ACPI DSDT table using /proc/acpi/dsdt.
-
 config X86_PM_TIMER
 	bool "Power Management Timer Support" if EMBEDDED
 	depends on X86

drivers/acpi/Makefile

@@ -52,7 +52,7 @@ obj-$(CONFIG_ACPI_PROCESSOR)	+= processor.o
 obj-$(CONFIG_ACPI_CONTAINER)	+= container.o
 obj-$(CONFIG_ACPI_THERMAL)	+= thermal.o
 obj-y				+= power.o
-obj-$(CONFIG_ACPI_SYSTEM)	+= system.o event.o
+obj-y				+= system.o event.o
 obj-$(CONFIG_ACPI_DEBUG)	+= debug.o
 obj-$(CONFIG_ACPI_NUMA)		+= numa.o
 obj-$(CONFIG_ACPI_HOTPLUG_MEMORY)	+= acpi_memhotplug.o