vgabios: Rename vga.c to vgabios.c.

Also, rename vgatables.h to vgabios.h.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/vgasrc/bochsvga.h b/vgasrc/bochsvga.h
index aaa3a97..f0263d7 100644
--- a/vgasrc/bochsvga.h
+++ b/vgasrc/bochsvga.h
@@ -1,5 +1,5 @@
-#ifndef __DISPI_H
-#define __DISPI_H
+#ifndef __BOCHSVGA_H
+#define __BOCHSVGA_H
 
 #include "types.h" // u8
 #include "ioport.h" // outb
@@ -64,4 +64,4 @@
 int bochsvga_hires_enabled(void);
 u16 bochsvga_curr_mode(void);
 
-#endif
+#endif // bochsvga.h