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/tools/socfpgaimage.c b/tools/socfpgaimage.c
index 72d8b96..8fa0983 100644
--- a/tools/socfpgaimage.c
+++ b/tools/socfpgaimage.c
@@ -55,6 +55,7 @@
 #include "pbl_crc32.h"
 #include "imagetool.h"
 #include "mkimage.h"
+#include <u-boot/crc.h>
 
 #include <image.h>