common: Drop linux/bug.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/clk/clk_pic32.c b/drivers/clk/clk_pic32.c
index 79469c4..7ddff2f 100644
--- a/drivers/clk/clk_pic32.c
+++ b/drivers/clk/clk_pic32.c
@@ -12,6 +12,7 @@
 #include <wait_bit.h>
 #include <dm/lists.h>
 #include <asm/io.h>
+#include <linux/bug.h>
 #include <mach/pic32.h>
 #include <dt-bindings/clock/microchip,clock.h>