[ACPI] delete CONFIG_ACPI_BUS

it is a synonym for CONFIG_ACPI

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 97034d3..56de409 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -80,7 +80,7 @@
 config SERIAL_8250_ACPI
 	bool "8250/16550 device discovery via ACPI namespace"
 	default y if IA64
-	depends on ACPI_BUS && SERIAL_8250
+	depends on ACPI && SERIAL_8250
 	---help---
 	  If you wish to enable serial port discovery via the ACPI
 	  namespace, say Y here.  If unsure, say N.