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/pblimage.c b/tools/pblimage.c
index d11f9af..3c823e9 100644
--- a/tools/pblimage.c
+++ b/tools/pblimage.c
@@ -6,6 +6,7 @@
 #include <image.h>
 #include "pblimage.h"
 #include "pbl_crc32.h"
+#include <u-boot/crc.h>
 
 #define roundup(x, y)		((((x) + ((y) - 1)) / (y)) * (y))
 #define PBL_ACS_CONT_CMD	0x81000000