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/common/android_ab.c b/common/android_ab.c
index 05ffc6f..6c4df41 100644
--- a/common/android_ab.c
+++ b/common/android_ab.c
@@ -8,6 +8,7 @@
 #include <linux/err.h>
 #include <memalign.h>
 #include <u-boot/crc.h>
+#include <u-boot/crc.h>
 
 /**
  * Compute the CRC-32 of the bootloader control struct.