[ACPI] build EC driver on IA64

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index fe1e812..0c6abf4 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -270,7 +270,6 @@
 
 config ACPI_EC
 	bool
-	depends on X86
 	default y
 	help
 	  This driver is required on some systems for the proper operation of