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/regulator/rk8xx.c b/drivers/power/regulator/rk8xx.c
index e99331f..a08e215 100644
--- a/drivers/power/regulator/rk8xx.c
+++ b/drivers/power/regulator/rk8xx.c
@@ -11,6 +11,7 @@
 #include <common.h>
 #include <dm.h>
 #include <errno.h>
+#include <log.h>
 #include <power/rk8xx_pmic.h>
 #include <power/pmic.h>
 #include <power/regulator.h>