crc32: Use the crc.h header for crc functions

Drop inclusion of crc.h in common.h and use the correct header directly
instead.

With this we can drop the conflicting definition in fw_env.h and rely on
the crc.h header, which is already included.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/lib/zlib/deflate.c b/lib/zlib/deflate.c
index 9a20b70..1fe58d5 100644
--- a/lib/zlib/deflate.c
+++ b/lib/zlib/deflate.c
@@ -50,6 +50,7 @@
 /* @(#) $Id$ */
 
 #include "deflate.h"
+#include <u-boot/crc.h>
 
 const char deflate_copyright[] =
    " deflate 1.2.5 Copyright 1995-2010 Jean-loup Gailly and Mark Adler ";