Rename variables for clarity.
* video/i386/pc/vbe.c (active_mode_info): Renamed to ...
(active_vbe_mode_info): ... this. All users updated.
(framebuffer): Rename 'active_mode' to 'active_vbe_mode'.
All users updated.
(initial_mode): Rename to ...
(initial_vbe_mode): ... this. All users updated.
(mode_in_use): Rename to ..
(vbe_mode_in_use): ... this. All users updated.
(mode_list): Rename to ..
(vbe_mode_list): ... this. All users updated.
(grub_vbe_set_video_mode): Rename 'mode' to 'vbe_mode', 'mode_info' to
'vbe_mode_info' and 'old_mode' to 'old_vbe_mode'.
(grub_video_vbe_init): Rename 'rm_mode_list' to 'rm_vbe_mode_list' and
'mode_list_size' to 'vbe_mode_list_size'.
(grub_video_vbe_setup): Rename 'mode_info' to 'vbe_mode_info',
'best_mode_info' to 'best_vbe_mode_info' and
'best_mode' to 'best_vbe_mode'
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