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

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

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/env/attr.c b/env/attr.c
index a958c71..fed5b21 100644
--- a/env/attr.c
+++ b/env/attr.c
@@ -4,13 +4,13 @@
  * Joe Hershberger, National Instruments, joe.hershberger@ni.com
  */
 
+#include <stdio.h>
 #ifdef USE_HOSTCC /* Eliminate "ANSI does not permit..." warnings */
 #include <stdint.h>
-#include <stdio.h>
 #include <linux/linux_string.h>
 #else
-#include <common.h>
 #include <slre.h>
+#include <vsprintf.h>
 #endif
 
 #include <env_attr.h>