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/drivers/net/fm/fm.c b/drivers/net/fm/fm.c
index 4c9dce8..926cf81 100644
--- a/drivers/net/fm/fm.c
+++ b/drivers/net/fm/fm.c
@@ -8,6 +8,7 @@
 #include <malloc.h>
 #include <asm/io.h>
 #include <linux/errno.h>
+#include <u-boot/crc.h>
 
 #include "fm.h"
 #include <fsl_qe.h>		/* For struct qe_firmware */