arch: Remove unnecessary inclusions of asm/semaphore.h

None of these files use any of the functionality promised by
asm/semaphore.h.  It's possible that they rely on it dragging in some
unrelated header file, but I can't build all these files, so we'll have
fix any build failures as they come up.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>

arch/m68k/atari/stram.c

@@ -29,7 +29,6 @@
 #include <asm/atarihw.h>
 #include <asm/atari_stram.h>
 #include <asm/io.h>
-#include <asm/semaphore.h>
 
 #undef DEBUG