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/power/power_i2c.c b/drivers/power/power_i2c.c
index b30f223..5a0455e 100644
--- a/drivers/power/power_i2c.c
+++ b/drivers/power/power_i2c.c
@@ -11,6 +11,7 @@
  */
 
 #include <common.h>
+#include <log.h>
 #include <linux/types.h>
 #include <power/pmic.h>
 #include <i2c.h>