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/drivers/sound/sound.c b/drivers/sound/sound.c
index dd3f9db..b0eab23 100644
--- a/drivers/sound/sound.c
+++ b/drivers/sound/sound.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <sound.h>
 
 void sound_create_square_wave(uint sample_rate, unsigned short *data, int size,