device: Rename device_simple.c --> device_const.c

In early stages (pre ramstage), we have two notions of devices.
To access the hardware, "simple device" handles are used. These
are plain numbers. To access the static information of the device
tree, we use `struct device` pointers. This is referred to as
DEVTREE_EARLY in the code.

This file is about the latter and its name reflects that the
tree remains unmodified.

Change-Id: I31aeb118615e86026f7111f83a7866d4e7426170
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/26293
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/device/Makefile.inc

@@ -21,12 +21,12 @@ ifeq ($(CONFIG_AZALIA_PLUGIN_SUPPORT),y)
 ramstage-srcs += src/mainboard/$(MAINBOARDDIR)/hda_verb.c
 endif
 
-bootblock-y += device_simple.c
-postcar-y += device_simple.c
-smm-y += device_simple.c
-verstage-y += device_simple.c
-romstage-y += device_simple.c
-ramstage-y += device_simple.c
+bootblock-y += device_const.c
+postcar-y += device_const.c
+smm-y += device_const.c
+verstage-y += device_const.c
+romstage-y += device_const.c
+ramstage-y += device_const.c
 romstage-$(CONFIG_PCI) += pci_early.c
 
 subdirs-y += oprom dram