[ACPI] build EC driver on IA64

Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: NLen Brown <len.brown@intel.com>

drivers/acpi/Kconfig

@@ -270,7 +270,6 @@ config ACPI_DEBUG
 
 config ACPI_EC
 	bool
-	depends on X86
 	default y
 	help
 	  This driver is required on some systems for the proper operation of