common: Drop linux/bitops.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/cpu/mpc83xx_cpu.c b/drivers/cpu/mpc83xx_cpu.c
index c1a7a55..f8a84ba 100644
--- a/drivers/cpu/mpc83xx_cpu.c
+++ b/drivers/cpu/mpc83xx_cpu.c
@@ -11,6 +11,7 @@
 #include <dm.h>
 #include <log.h>
 #include <vsprintf.h>
+#include <linux/bitops.h>
 
 #include "mpc83xx_cpu.h"