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>

common/iotrace.c

@@ -8,6 +8,7 @@
 #include <common.h>
 #include <mapmem.h>
 #include <asm/io.h>
+#include <u-boot/crc.h>
 
 DECLARE_GLOBAL_DATA_PTR;