qemu: complete bochs dispi interface vga driver.

Ditch unused fb*.h files.
Rename init.c (name is _way_ to generic) to bochs.c.
Add proper bochs dispi interface detection and mode setup.
Hook up coreboot framebuffer table initialization.

Change-Id: I7154b1593902e7d42606b64819217872eee10683
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-on: http://review.coreboot.org/3500
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/mainboard/emulation/qemu-i440fx/Kconfig

@@ -12,6 +12,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select HAVE_ACPI_RESUME
 	select BOARD_ROMSIZE_KB_256
 	select EARLY_CBMEM_INIT
+	select MAINBOARD_HAS_NATIVE_VGA_INIT
 
 config MAINBOARD_DIR
 	string