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>

examples/api/glue.c

@@ -7,6 +7,7 @@
 #include <env.h>
 #include <linux/types.h>
 #include <api_public.h>
+#include <u-boot/crc.h>
 
 #include "glue.h"