common: Drop log.h from common header

Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/nvidia/p2571/p2571.c b/board/nvidia/p2571/p2571.c
index a9e4d21..a4c4259 100644
--- a/board/nvidia/p2571/p2571.c
+++ b/board/nvidia/p2571/p2571.c
@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <i2c.h>
+#include <log.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/pinmux.h>
 #include <asm/gpio.h>