common: Remove <common.h> and add needed includes

Remove <common.h> from all "commmon/" files and when needed add
missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/common/flash.c b/common/flash.c
index 848f44e..24ddc8b 100644
--- a/common/flash.c
+++ b/common/flash.c
@@ -6,10 +6,10 @@
 
 /* #define DEBUG */
 
-#include <common.h>
 #include <flash.h>
 #include <log.h>
 #include <uuid.h>
+#include <linux/string.h>
 
 #include <mtd/cfi_flash.h>