sh: Add a dummy vga.h.

We have nothing to do here, but there are continually drivers that
fail to build without it. Stub it in.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/asm-sh/vga.h

+#ifndef __ASM_SH_VGA_H
+#define __ASM_SH_VGA_H
+
+/* Stupid drivers. */
+
+#endif /* __ASM_SH_VGA_H */