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/spi-sifive.c b/drivers/spi/spi-sifive.c
index 4cab039..0e0ce25 100644
--- a/drivers/spi/spi-sifive.c
+++ b/drivers/spi/spi-sifive.c
@@ -13,6 +13,7 @@
 #include <spi-mem.h>
 #include <wait_bit.h>
 #include <asm/io.h>
+#include <linux/bitops.h>
 #include <linux/log2.h>
 #include <clk.h>