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/adc/meson-saradc.c b/drivers/adc/meson-saradc.c
index 1e1515f..72b0cc4 100644
--- a/drivers/adc/meson-saradc.c
+++ b/drivers/adc/meson-saradc.c
@@ -14,6 +14,7 @@
 #include <regmap.h>
 #include <errno.h>
 #include <asm/io.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/math64.h>
 #include <linux/bitfield.h>