coreboot_tables: specify clear interface for lb_framebuffer()

For some reason the "interface" for adding framebuffer information
is sitting in src/include/vbe.h while also guarding the call to
fill_lb_framebuffer() with vbe_mode_info_valid() along with some
macro if CONFIG_* for good measure.

Move the fill_lb_framebuffer() declaration to coreboot_tables.h and
provide a comment about how it should be used. Also, now that
there's no need for the notion of a global vbe_mode_info_valid()
remove it from the conditional call path of fill_lb_framebuffer().

Change-Id: Ib3ade6314624091ae70424664527a02b279d0c9b
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/19729
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/include/vbe.h

@@ -112,7 +112,6 @@ typedef struct {
 #define VESA_SET_MODE		0x4f02
 
 int vbe_mode_info_valid(void);
-void fill_lb_framebuffer(struct lb_framebuffer *framebuffer);
 void vbe_set_graphics(void);
 void vbe_textmode_console(void);