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/gpio/stm32_gpio.c b/drivers/gpio/stm32_gpio.c
index 451724e..4f710b6 100644
--- a/drivers/gpio/stm32_gpio.c
+++ b/drivers/gpio/stm32_gpio.c
@@ -14,6 +14,7 @@
 #include <asm/gpio.h>
 #include <asm/io.h>
 #include <dm/device_compat.h>
+#include <linux/bitops.h>
 #include <linux/errno.h>
 #include <linux/io.h>