ACPI / bus: Correct the comments about acpi_subsystem_init()

In acpi_subsystem_init(), function acpi_enable_subsystem() is
called to do the real job. However with different flags passed to
acpi_enable_subsystem(), different code is executed.

In acpi_subsystem_init(), with "~ACPI_NO_ACPI_ENABLE" passed in, it
will only switch over the platform to the ACPI mode. The remaining
part of acpi_enable_subsystem() is done when acpi_bus_init() is
called.

So the comments above acpi_subsystem_init() is not exact, change it
here.
Signed-off-by: NBaoquan He <bhe@redhat.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/bus.c

@@ -956,8 +956,7 @@ void __init acpi_early_init(void)
 /**
  * acpi_subsystem_init - Finalize the early initialization of ACPI.
  *
- * Switch over the platform to the ACPI mode (if possible), initialize the
- * handling of ACPI events, install the interrupt and global lock handlers.
+ * Switch over the platform to the ACPI mode (if possible).
  *
  * Doing this too early is generally unsafe, but at the same time it needs to be
  * done before all things that really depend on ACPI.  The right spot appears to