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/ram/imxrt_sdram.c b/drivers/ram/imxrt_sdram.c
index 80fcb7e..765a214 100644
--- a/drivers/ram/imxrt_sdram.c
+++ b/drivers/ram/imxrt_sdram.c
@@ -11,6 +11,7 @@
 #include <log.h>
 #include <ram.h>
 #include <asm/io.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/err.h>