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/spi/atmel_spi.h b/drivers/spi/atmel_spi.h
index 76b8556..6167bd1 100644
--- a/drivers/spi/atmel_spi.h
+++ b/drivers/spi/atmel_spi.h
@@ -3,6 +3,7 @@
  */
 
 /* Register offsets */
+#include <linux/bitops.h>
 #define ATMEL_SPI_CR			0x0000
 #define ATMEL_SPI_MR			0x0004
 #define ATMEL_SPI_RDR			0x0008