Support setenv_ulong() and setenv_addr() for powerpc

This includes were outside an #ifdef CONFIG_PPC, but there is not reason
to exclude powerpc from using them.

Move the declaration outside the #ifdef.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/common.h

@@ -345,9 +345,9 @@ int	saveenv	     (void);
 int inline setenv    (const char *, const char *);
 #else
 int	setenv	     (const char *, const char *);
+#endif /* CONFIG_PPC */
 int setenv_ulong(const char *varname, ulong value);
 int setenv_addr(const char *varname, const void *addr);
-#endif /* CONFIG_PPC */
 #ifdef CONFIG_ARM
 # include <asm/mach-types.h>
 # include <asm/setup.h>