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/arch/arm/mach-tegra/board2.c b/arch/arm/mach-tegra/board2.c
index 224efc9..48c4f32 100644
--- a/arch/arm/mach-tegra/board2.c
+++ b/arch/arm/mach-tegra/board2.c
@@ -9,6 +9,7 @@
 #include <env.h>
 #include <errno.h>
 #include <init.h>
+#include <log.h>
 #include <ns16550.h>
 #include <usb.h>
 #include <asm/io.h>