alpha: use generic fb.h

The arch uses a verbatim copy of the asm-generic version and does not
add any own implemntations to the header, so use asm-generic/fb.h
instead of duplicating code.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Matt Turner <mattst88@gmail.com>

arch/alpha/include/asm/Kbuild

@@ -3,6 +3,7 @@
 generic-y += clkdev.h
 generic-y += exec.h
 generic-y += export.h
+generic-y += fb.h
 generic-y += irq_work.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h

arch/alpha/include/asm/fb.h

-#ifndef _ASM_FB_H_
-#define _ASM_FB_H_
-#include <linux/device.h>
-
-/* Caching is off in the I/O space quadrant by design.  */
-#define fb_pgprotect(...) do {} while (0)
-
-static inline int fb_is_primary_device(struct fb_info *info)
-{
-	return 0;
-}
-
-#endif /* _ASM_FB_H_ */