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/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index 16cdfe3..6be40d0 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -25,6 +25,7 @@
 #include <flash.h>
 #include <init.h>
 #include <irq_func.h>
+#include <log.h>
 #include <asm/processor.h>
 #include <asm/io.h>
 #include <asm/byteorder.h>