sparc32,leon: clean up leon.h

- Drop unused stuff accumulated over time
- Drop non-leon stuff
- Include almost all of the header unconditionally

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Daniel Hellstrom <daniel@gaisler.com>
Cc: Konrad Eisele <konrad@gaisler.com>

arch/sparc/kernel/leon_kernel.c

@@ -23,6 +23,7 @@
 #include <asm/smp.h>
 #include <asm/setup.h>
 
+#include "kernel.h"
 #include "prom.h"
 #include "irq.h"