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/gpio/hsdk-creg-gpio.c b/drivers/gpio/hsdk-creg-gpio.c
index 800027f..8eeb384 100644
--- a/drivers/gpio/hsdk-creg-gpio.c
+++ b/drivers/gpio/hsdk-creg-gpio.c
@@ -9,6 +9,7 @@
  * warranty of any kind, whether express or implied.
  */
 
+#include <log.h>
 #include <asm-generic/gpio.h>
 #include <asm/io.h>
 #include <common.h>