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/timer/atmel_pit_timer.c b/drivers/timer/atmel_pit_timer.c
index 009af2f..7051169 100644
--- a/drivers/timer/atmel_pit_timer.c
+++ b/drivers/timer/atmel_pit_timer.c
@@ -9,6 +9,7 @@
 #include <dm.h>
 #include <timer.h>
 #include <asm/io.h>
+#include <linux/bitops.h>
 
 #define AT91_PIT_VALUE		0xfffff
 #define AT91_PIT_PITEN		BIT(24)		/* Timer Enabled */