[SERIAL] Discover ACPI serial ports before plug-in ports

Patch from: Bjorn Helgaas

This makes us discover ACPI serial ports before PCI ones.  The ACPI
ports tend to be built-in, and discovering them late means their ttyS
names move around if PCI serial ports are added or removed.  I think
it makes more sense to have relatively predictable and consistent
names for the built-in hardware.

drivers/serial/Makefile

@@ -5,11 +5,11 @@
 #
 
 serial-8250-y :=
+serial-8250-$(CONFIG_SERIAL_8250_ACPI) += 8250_acpi.o
 serial-8250-$(CONFIG_GSC) += 8250_gsc.o
 serial-8250-$(CONFIG_PCI) += 8250_pci.o
 serial-8250-$(CONFIG_PNP) += 8250_pnp.o
 serial-8250-$(CONFIG_SERIAL_8250_HCDP) += 8250_hcdp.o
-serial-8250-$(CONFIG_SERIAL_8250_ACPI) += 8250_acpi.o
 
 obj-$(CONFIG_SERIAL_CORE) += serial_core.o
 obj-$(CONFIG_SERIAL_21285) += 21285.o