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/fs/jffs2/jffs2_1pass.c b/fs/jffs2/jffs2_1pass.c
index 6bf1943..5912cde 100644
--- a/fs/jffs2/jffs2_1pass.c
+++ b/fs/jffs2/jffs2_1pass.c
@@ -118,6 +118,7 @@
 #include <linux/compiler.h>
 #include <linux/stat.h>
 #include <linux/time.h>
+#include <u-boot/crc.h>
 #include <watchdog.h>
 #include <jffs2/jffs2.h>
 #include <jffs2/jffs2_1pass.h>