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/misc/atsha204a-i2c.c b/drivers/misc/atsha204a-i2c.c
index 934ba5e..116c066 100644
--- a/drivers/misc/atsha204a-i2c.c
+++ b/drivers/misc/atsha204a-i2c.c
@@ -15,6 +15,7 @@
 #include <i2c.h>
 #include <errno.h>
 #include <atsha204a-i2c.h>
+#include <u-boot/crc.h>
 
 #define ATSHA204A_TWLO			60
 #define ATSHA204A_TRANSACTION_TIMEOUT	100000