lib: Remove unnecessary inclusions of asm/semaphore.h

reed_solomon doesn't use any of the functionality promised by
asm/semaphore.h.

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

lib/reed_solomon/reed_solomon.c

@@ -45,7 +45,6 @@
 #include <linux/rslib.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
-#include <asm/semaphore.h>
 
 /* This list holds all currently allocated rs control structures */
 static LIST_HEAD (rslist);