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/pci/pcie_xilinx.c b/drivers/pci/pcie_xilinx.c
index 05787ae..713ad49 100644
--- a/drivers/pci/pcie_xilinx.c
+++ b/drivers/pci/pcie_xilinx.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <dm.h>
 #include <pci.h>
+#include <linux/bitops.h>
 
 #include <asm/io.h>