boot_loader: Add a video_text_console for potential use by bootloaders.

This uses the frame buffer console that KDL uses. It needs some work,
though, as the frame_buffer_console colors system is not quite compatible.

headers/private/kernel/boot/platform/generic/video.h

@@ -34,6 +34,9 @@ void uncompress_8bit_RLE(const uint8 compressed[], uint8 *uncompressed);
 /* default splash display */
 status_t video_display_splash(addr_t frameBuffer);
 
+/* video text console */
+status_t video_text_console_init(addr_t frameBuffer);
+
 #ifdef __cplusplus
 }
 #endif