ACPI / PM: Fix build problem when CONFIG_ACPI or CONFIG_PM is not set

Commit e5cc8ef3 (ACPI / PM: Provide ACPI PM callback routines for
subsystems) introduced a build problem occuring if CONFIG_ACPI is
unset or CONFIG_PM is unset and errno.h is not included before
acpi.h, because in that case ENODEV used in acpi.h is undefined.

Fix the issue by making acpi.h include errno.h.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

include/linux/acpi.h

@@ -25,6 +25,7 @@
 #ifndef _LINUX_ACPI_H
 #define _LINUX_ACPI_H
 
+#include <linux/errno.h>
 #include <linux/ioport.h>	/* for struct resource */
 
 #ifdef	CONFIG_ACPI