Kconfig: Move and clean up CONFIG_VGA

Change-Id: I6e710b95cade0ea68f787f33c0070613d64b6da6
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/19743
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/Kconfig

@@ -550,12 +550,6 @@ config USE_WATCHDOG_ON_BOOT
 	bool
 	default n
 
-config VGA
-	bool
-	default n
-	help
-	  Build board-specific VGA code.
-
 config GFXUMA
 	bool
 	default n

src/drivers/pc80/vga/Kconfig

@@ -0,0 +1,4 @@
+config VGA
+	bool
+	help
+	  Include legacy VGA support code.

src/include/pc80/vga.h

@@ -22,8 +22,6 @@
 #define VGA_COLUMNS 80
 #define VGA_LINES 25
 
-#if CONFIG_VGA
-
 void vga_io_init(void);
 
 void vga_textmode_init(void);
@@ -36,6 +34,4 @@ void vga_frame_set(unsigned int line, unsigned int character);
 
 void vga_line_write(unsigned int line, const char *string);
 
-#endif /* CONFIG_VGA */
-
 #endif /* VGA_H */